fix: bump release-please from 15.7.0 to 15.8.0 (#720)

Bumps [release-please](https://github.com/googleapis/release-please)
from 15.7.0 to 15.8.0.
<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>v15.8.0</h2>
<h2><a
href="https://github.com/googleapis/release-please/compare/v15.7.0...v15.8.0">15.8.0</a>
(2023-02-15)</h2>
<h3>Features</h3>
<ul>
<li>Scan readme files in java-yoshi-mono-repo strategy (<a
href="https://github-redirect.dependabot.com/googleapis/release-please/issues/1853">#1853</a>)
(<a
href="https://github.com/googleapis/release-please/commit/635cc7d03820d539f470c151db410dd2a8d29eae">635cc7d</a>)</li>
</ul>
<h3>Bug Fixes</h3>
<ul>
<li>Github issues link (<a
href="https://github-redirect.dependabot.com/googleapis/release-please/issues/1849">#1849</a>)
(<a
href="https://github.com/googleapis/release-please/commit/68e67591bbae5db51ce0ce7591898a2adf49be96">68e6759</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/v15.7.0...v15.8.0">15.8.0</a>
(2023-02-15)</h2>
<h3>Features</h3>
<ul>
<li>Scan readme files in java-yoshi-mono-repo strategy (<a
href="https://github-redirect.dependabot.com/googleapis/release-please/issues/1853">#1853</a>)
(<a
href="https://github.com/googleapis/release-please/commit/635cc7d03820d539f470c151db410dd2a8d29eae">635cc7d</a>)</li>
</ul>
<h3>Bug Fixes</h3>
<ul>
<li>Github issues link (<a
href="https://github-redirect.dependabot.com/googleapis/release-please/issues/1849">#1849</a>)
(<a
href="https://github.com/googleapis/release-please/commit/68e67591bbae5db51ce0ce7591898a2adf49be96">68e6759</a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/googleapis/release-please/commit/8027800cfd00c425fc575f1f2a72766308ba1e73"><code>8027800</code></a>
chore(main): release 15.8.0 (<a
href="https://github-redirect.dependabot.com/googleapis/release-please/issues/1854">#1854</a>)</li>
<li><a
href="https://github.com/googleapis/release-please/commit/68e67591bbae5db51ce0ce7591898a2adf49be96"><code>68e6759</code></a>
fix: github issues link (<a
href="https://github-redirect.dependabot.com/googleapis/release-please/issues/1849">#1849</a>)</li>
<li><a
href="https://github.com/googleapis/release-please/commit/635cc7d03820d539f470c151db410dd2a8d29eae"><code>635cc7d</code></a>
feat: Scan readme files in java-yoshi-mono-repo strategy (<a
href="https://github-redirect.dependabot.com/googleapis/release-please/issues/1853">#1853</a>)</li>
<li>See full diff in <a
href="https://github.com/googleapis/release-please/compare/v15.7.0...v15.8.0">compare
view</a></li>
</ul>
</details>
<br />


[![Dependabot compatibility
score](https://dependabot-badges.githubapp.com/badges/compatibility_score?dependency-name=release-please&package-manager=npm_and_yarn&previous-version=15.7.0&new-version=15.8.0)](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`.

[//]: # (dependabot-automerge-start)
[//]: # (dependabot-automerge-end)

---

<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 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>

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": "^15.7.0"
+    "release-please": "^15.8.0"
   },
   "devDependencies": {
     "@vercel/ncc": "^0.27.0",