Reverts "Bump actions/labeler from 4.3.0 to 5.0.0" (flutter#5579)

Reverts flutter#5568
Initiated by: stuartmorgan
This change reverts the following previous change:
Original Description:
Bumps [actions/labeler](https://github.com/actions/labeler) from 4.3.0 to 5.0.0.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/actions/labeler/releases">actions/labeler's releases</a>.</em></p>
<blockquote>
<h2>v5.0.0</h2>
<h2>What's Changed</h2>
<p>This release contains the following breaking changes:</p>
<ol>
<li>
<p>The ability to apply labels based on the names of base and/or head branches was added (<a href="https://redirect.github.com/actions/labeler/issues/186">#186</a> and <a href="https://redirect.github.com/actions/labeler/issues/54">#54</a>). The match object for changed files was expanded with new combinations in order to make it more intuitive and flexible (<a href="https://redirect.github.com/actions/labeler/issues/423">#423</a> and <a href="https://redirect.github.com/actions/labeler/issues/101">#101</a>). As a result, the configuration file structure was significantly redesigned and is not compatible with the structure of the previous version. Please read the <a href="https://github.com/actions/labeler/tree/main#pull-request-labeler">action documentation</a> to find out how to adapt your configuration files for use with the new action version.</p>
</li>
<li>
<p>The bug related to the <code>sync-labels</code> input was fixed (<a href="https://redirect.github.com/actions/labeler/issues/112">#112</a>). Now the input value is read correctly.</p>
</li>
<li>
<p>By default, <code>dot</code> input is set to <code>true</code>. Now, paths starting with a dot (e.g. <code>.github</code>) are matched by default.</p>
</li>
<li>
<p>Version 5 of this action updated the <a href="https://docs.github.com/en/actions/creating-actions/metadata-syntax-for-github-actions#runs-for-javascript-actions">runtime to Node.js 20</a>. All scripts are now run with Node.js 20 instead of Node.js 16 and are affected by any breaking changes between Node.js 16 and 20.</p>
</li>
</ol>
<p>For more information, please read the <a href="https://github.com/actions/labeler/tree/main#pull-request-labeler">action documentation</a>.</p>
<h2>New Contributors</h2>
<ul>
<li><a href="https://github.com/joshdales"><code>@​joshdales</code></a> made their first contribution in <a href="https://redirect.github.com/actions/labeler/pull/203">actions/labeler#203</a></li>
<li><a href="https://github.com/dusan-trickovic"><code>@​dusan-trickovic</code></a> made their first contribution in <a href="https://redirect.github.com/actions/labeler/pull/626">actions/labeler#626</a></li>
<li><a href="https://github.com/sungh0lim"><code>@​sungh0lim</code></a> made their first contribution in <a href="https://redirect.github.com/actions/labeler/pull/630">actions/labeler#630</a></li>
<li><a href="https://github.com/TrianguloY"><code>@​TrianguloY</code></a> made their first contribution in <a href="https://redirect.github.com/actions/labeler/pull/629">actions/labeler#629</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a href="https://github.com/actions/labeler/compare/v4...v5.0.0">https://github.com/actions/labeler/compare/v4...v5.0.0</a></p>
<h2>v5.0.0-beta.1</h2>
<h2>What's Changed</h2>
<p>In scope of this beta release, the structure of the configuration file (<code>.github/labeler.yml</code>) was changed from</p>
<pre lang="yml"><code>LabelName:
- any:
  - changed-files: ['list', 'of', 'globs']
  - base-branch: ['list', 'of', 'regexps']
  - head-branch: ['list', 'of', 'regexps']
- all:
  - changed-files: ['list', 'of', 'globs']
  - base-branch: ['list', 'of', 'regexps']
  - head-branch: ['list', 'of', 'regexps']
</code></pre>
<p>to</p>
<pre lang="yml"><code>LabelName:
- any:
  - changed-files: 
    - AnyGlobToAnyFile: ['list', 'of', 'globs']
    - AnyGlobToAllFiles: ['list', 'of', 'globs']
    - AllGlobsToAnyFile: ['list', 'of', 'globs']
    - AllGlobsToAllFiles: ['list', 'of', 'globs']
  - base-branch: ['list', 'of', 'regexps']
  - head-branch: ['list', 'of', 'regexps']
- all:
  - changed-files:
    - AnyGlobToAnyFile: ['list', 'of', 'globs']
    - AnyGlobToAllFiles: ['list', 'of', 'globs']
    - AllGlobsToAnyFile: ['list', 'of', 'globs']
&lt;/tr&gt;&lt;/table&gt; 
</code></pre>
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/actions/labeler/commit/8558fd74291d67161a8a78ce36a881fa63b766a9"><code>8558fd7</code></a> Merge pull request <a href="https://redirect.github.com/actions/labeler/issues/709">#709</a> from actions/v5.0.0-beta</li>
<li><a href="https://github.com/actions/labeler/commit/000ca75fe6c5838c790ca73b764419065c1594a6"><code>000ca75</code></a> Merge pull request <a href="https://redirect.github.com/actions/labeler/issues/700">#700</a> from MaksimZhukov/apply-suggestions-and-update-docume...</li>
<li><a href="https://github.com/actions/labeler/commit/cb66c2f0788d382da1dabd06a094c0bc6ed3e26a"><code>cb66c2f</code></a> Update dist</li>
<li><a href="https://github.com/actions/labeler/commit/9181355e36dc8e434c93ba5aaa33f699c4162f38"><code>9181355</code></a> Apply suggestions for the beta vesrion and update the documentation</li>
<li><a href="https://github.com/actions/labeler/commit/efe4c1c90edf0ec238b5ee13e66e1abcbbe7446e"><code>efe4c1c</code></a> Merge pull request <a href="https://redirect.github.com/actions/labeler/issues/699">#699</a> from MaksimZhukov/update-node-runtime-and-dependencies</li>
<li><a href="https://github.com/actions/labeler/commit/c0957ad7c30fb0638e275122d51df2330459854a"><code>c0957ad</code></a> Run Prettier</li>
<li><a href="https://github.com/actions/labeler/commit/8dc8d1842f2f3ed1cf6f4190490ad02e0a755f0c"><code>8dc8d18</code></a> Update Node.js version in reusable workflows</li>
<li><a href="https://github.com/actions/labeler/commit/d0d0bbebfbe119c8403a0e2724c5fa5b555c78b9"><code>d0d0bbe</code></a> Update documentation</li>
<li><a href="https://github.com/actions/labeler/commit/1375c42512e0b855687040307d6dcaf403da9a4e"><code>1375c42</code></a> 5.0.0</li>
<li><a href="https://github.com/actions/labeler/commit/ab7411ec21ea67102994adc0fa01b3f5cf63509f"><code>ab7411e</code></a> Change version of Node.js runtime to node20</li>
<li>Additional commits viewable in <a href="https://github.com/actions/labeler/compare/ac9175f8a1f3625fd0d4fb234536d26811351594...8558fd74291d67161a8a78ce36a881fa63b766a9">compare view</a></li>
</ul>
</details>
<br />

[![Dependabot compatibility score](https://dependabot-badges.githubapp.com/badges/compatibility_score?dependency-name=actions/labeler&package-manager=github_actions&previous-version=4.3.0&new-version=5.0.0)](https://docs.github.com/en/github/managing-security-vulnerabilities/about-dependabot-security-updates#about-compatibility-scores)

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting `@dependabot rebase`.

---

<details>
<summary>Dependabot commands and options</summary>
<br />

You can trigger Dependabot actions by commenting on this PR:
- `@dependabot rebase` will rebase this PR
- `@dependabot recreate` will recreate this PR, overwriting any edits that have been made to it
- `@dependabot merge` will merge this PR after your CI passes on it
- `@dependabot squash and merge` will squash and merge this PR after your CI passes on it
- `@dependabot cancel merge` will cancel a previously requested merge and block automerging
- `@dependabot reopen` will reopen this PR if it is closed
- `@dependabot close` will close this PR and stop Dependabot recreating it. You can achieve the same result by closing it manually
- `@dependabot show <dependency name> ignore conditions` will show all of the ignore conditions of the specified dependency
- `@dependabot ignore this major version` will close this PR and stop Dependabot creating any more for this major version (unless you reopen the PR or upgrade to it yourself)
- `@dependabot ignore this minor version` will close this PR and stop Dependabot creating any more for this minor version (unless you reopen the PR or upgrade to it yourself)
- `@dependabot ignore this dependency` will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)

</details>

.github/workflows/pull_request_label.yml

@@ -21,7 +21,7 @@ jobs:
       pull-requests: write
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/labeler@8558fd74291d67161a8a78ce36a881fa63b766a9
+      - uses: actions/labeler@ac9175f8a1f3625fd0d4fb234536d26811351594
         with:
           repo-token: "${{ secrets.GITHUB_TOKEN }}"
           sync-labels: true