fix: bump release-please from 15.8.0 to 15.8.1 (#728)

Bumps [release-please](https://github.com/googleapis/release-please)
from 15.8.0 to 15.8.1.
<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>v15.8.1</h2>
<h2><a
href="https://github.com/googleapis/release-please/compare/v15.8.0...v15.8.1">15.8.1</a>
(2023-03-07)</h2>
<h3>Bug Fixes</h3>
<ul>
<li><strong>sequential-calls:</strong> Use push instead of concat when
returning releases (<a
href="https://github-redirect.dependabot.com/googleapis/release-please/issues/1865">#1865</a>)
(<a
href="https://github.com/googleapis/release-please/commit/1026c7366a94b4dbfa567580613bcf31a991a516">1026c73</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/v15.8.0...v15.8.1">15.8.1</a>
(2023-03-07)</h2>
<h3>Bug Fixes</h3>
<ul>
<li><strong>sequential-calls:</strong> Use push instead of concat when
returning releases (<a
href="https://github-redirect.dependabot.com/googleapis/release-please/issues/1865">#1865</a>)
(<a
href="https://github.com/googleapis/release-please/commit/1026c7366a94b4dbfa567580613bcf31a991a516">1026c73</a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/googleapis/release-please/commit/123a5981dd54c4c7ac37247a1ec7f6c17be0a258"><code>123a598</code></a>
chore(main): release 15.8.1 (<a
href="https://github-redirect.dependabot.com/googleapis/release-please/issues/1866">#1866</a>)</li>
<li><a
href="https://github.com/googleapis/release-please/commit/f5011a2f6455de721a1de0845a7b79b48e930cff"><code>f5011a2</code></a>
docs: add missing docs for include-component-in-tag (<a
href="https://github-redirect.dependabot.com/googleapis/release-please/issues/1855">#1855</a>)</li>
<li><a
href="https://github.com/googleapis/release-please/commit/1026c7366a94b4dbfa567580613bcf31a991a516"><code>1026c73</code></a>
fix(sequential-calls): Use push instead of concat when returning
releases (<a
href="https://github-redirect.dependabot.com/googleapis/release-please/issues/1">#1</a>...</li>
<li>See full diff in <a
href="https://github.com/googleapis/release-please/compare/v15.8.0...v15.8.1">compare
view</a></li>
</ul>
</details>
<br />


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score](https://dependabot-badges.githubapp.com/badges/compatibility_score?dependency-name=release-please&package-manager=npm_and_yarn&previous-version=15.8.0&new-version=15.8.1)](https://docs.github.com/en/github/managing-security-vulnerabilities/about-dependabot-security-updates#about-compatibility-scores)

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Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Jeff Ching <chingor@google.com>

package.json

@@ -26,7 +26,7 @@
   "homepage": "https://github.com/bcoe/release-please-action#readme",
   "dependencies": {
     "@actions/core": "^1.10.0",
-    "release-please": "^15.8.0"
+    "release-please": "^15.8.1"
   },
   "devDependencies": {
     "@vercel/ncc": "^0.27.0",