fix: bump release-please from 16.3.1 to 16.4.0 (#897)

Bumps [release-please](https://github.com/googleapis/release-please)
from 16.3.1 to 16.4.0.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/googleapis/release-please/releases">release-please's
releases</a>.</em></p>
<blockquote>
<h2>v16.4.0</h2>
<h2><a
href="https://github.com/googleapis/release-please/compare/v16.3.1...v16.4.0">16.4.0</a>
(2023-12-05)</h2>
<h3>Features</h3>
<ul>
<li><strong>types:</strong> Export types exposed by Manifest for use
downstream (<a
href="https://redirect.github.com/googleapis/release-please/issues/2147">#2147</a>)
(<a
href="https://github.com/googleapis/release-please/commit/b259d70270bd1c4358267aeff07de6aaaeddd9b9">b259d70</a>)</li>
<li>Update VERSION file in PHP repo if it exists (<a
href="https://redirect.github.com/googleapis/release-please/issues/2153">#2153</a>)
(<a
href="https://github.com/googleapis/release-please/commit/a7d3b73e605d0425b4a54a11ff2723a3075b4d3c">a7d3b73</a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/googleapis/release-please/blob/main/CHANGELOG.md">release-please's
changelog</a>.</em></p>
<blockquote>
<h2><a
href="https://github.com/googleapis/release-please/compare/v16.3.1...v16.4.0">16.4.0</a>
(2023-12-05)</h2>
<h3>Features</h3>
<ul>
<li><strong>types:</strong> Export types exposed by Manifest for use
downstream (<a
href="https://redirect.github.com/googleapis/release-please/issues/2147">#2147</a>)
(<a
href="https://github.com/googleapis/release-please/commit/b259d70270bd1c4358267aeff07de6aaaeddd9b9">b259d70</a>)</li>
<li>Update VERSION file in PHP repo if it exists (<a
href="https://redirect.github.com/googleapis/release-please/issues/2153">#2153</a>)
(<a
href="https://github.com/googleapis/release-please/commit/a7d3b73e605d0425b4a54a11ff2723a3075b4d3c">a7d3b73</a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/googleapis/release-please/commit/ea774cbb1ef76ada0897e057016c6ad4bb171104"><code>ea774cb</code></a>
chore(main): release 16.4.0 (<a
href="https://redirect.github.com/googleapis/release-please/issues/2154">#2154</a>)</li>
<li><a
href="https://github.com/googleapis/release-please/commit/b259d70270bd1c4358267aeff07de6aaaeddd9b9"><code>b259d70</code></a>
feat(types): export types exposed by Manifest for use downstream (<a
href="https://redirect.github.com/googleapis/release-please/issues/2147">#2147</a>)</li>
<li><a
href="https://github.com/googleapis/release-please/commit/a7d3b73e605d0425b4a54a11ff2723a3075b4d3c"><code>a7d3b73</code></a>
feat: update VERSION file in PHP repo if it exists (<a
href="https://redirect.github.com/googleapis/release-please/issues/2153">#2153</a>)</li>
<li>See full diff in <a
href="https://github.com/googleapis/release-please/compare/v16.3.1...v16.4.0">compare
view</a></li>
</ul>
</details>
<br />


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package.json

@@ -29,7 +29,7 @@
   "homepage": "https://github.com/bcoe/release-please-action#readme",
   "dependencies": {
     "@actions/core": "^1.10.0",
-    "release-please": "^16.3.1"
+    "release-please": "^16.4.0"
   },
   "devDependencies": {
     "@types/mocha": "^9.0.0",