fix: bump release-please from 15.11.0 to 15.12.0 (#790)

Bumps [release-please](https://github.com/googleapis/release-please)
from 15.11.0 to 15.12.0.
<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>v15.12.0</h2>
<h2><a
href="https://github.com/googleapis/release-please/compare/v15.11.2...v15.12.0">15.12.0</a>
(2023-07-11)</h2>
<h3>Features</h3>
<ul>
<li>Add PrereleaseVersioningStrategy (<a
href="https://redirect.github.com/googleapis/release-please/issues/1981">#1981</a>)
(<a
href="https://github.com/googleapis/release-please/commit/b070888f25eff6e28c25014bcf67d6f9d47b9717">b070888</a>)</li>
</ul>
<h2>v15.11.2</h2>
<h2><a
href="https://github.com/googleapis/release-please/compare/v15.11.1...v15.11.2">15.11.2</a>
(2023-07-10)</h2>
<h3>Bug Fixes</h3>
<ul>
<li><strong>deps:</strong> Update dependency
conventional-changelog-conventionalcommits to v6 (<a
href="https://redirect.github.com/googleapis/release-please/issues/1974">#1974</a>)
(<a
href="https://github.com/googleapis/release-please/commit/1998564555c472f4eb850cdcec99a009dd76f8ca">1998564</a>)</li>
<li><strong>deps:</strong> Update dependency
conventional-changelog-writer to v6 (<a
href="https://redirect.github.com/googleapis/release-please/issues/1975">#1975</a>)
(<a
href="https://github.com/googleapis/release-please/commit/a6aa293932200dd004024b8c8f6b458c2fa8f570">a6aa293</a>)</li>
</ul>
<h2>v15.11.1</h2>
<h2><a
href="https://github.com/googleapis/release-please/compare/v15.11.0...v15.11.1">15.11.1</a>
(2023-07-10)</h2>
<h3>Bug Fixes</h3>
<ul>
<li><strong>deps:</strong> Update dependency conventional-commits-filter
to v3 (<a
href="https://redirect.github.com/googleapis/release-please/issues/1976">#1976</a>)
(<a
href="https://github.com/googleapis/release-please/commit/20b8f345624f2a7e639df1a50ebda2719f9c2423">20b8f34</a>)</li>
<li><strong>python:</strong> Warn on dynamic pyproject.toml versioning
(<a
href="https://redirect.github.com/googleapis/release-please/issues/1983">#1983</a>)
(<a
href="https://github.com/googleapis/release-please/commit/5ee5baa0932d3435034b96183fed308eaf47ef73">5ee5baa</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/v15.11.2...v15.12.0">15.12.0</a>
(2023-07-11)</h2>
<h3>Features</h3>
<ul>
<li>Add PrereleaseVersioningStrategy (<a
href="https://redirect.github.com/googleapis/release-please/issues/1981">#1981</a>)
(<a
href="https://github.com/googleapis/release-please/commit/b070888f25eff6e28c25014bcf67d6f9d47b9717">b070888</a>)</li>
</ul>
<h2><a
href="https://github.com/googleapis/release-please/compare/v15.11.1...v15.11.2">15.11.2</a>
(2023-07-10)</h2>
<h3>Bug Fixes</h3>
<ul>
<li><strong>deps:</strong> Update dependency
conventional-changelog-conventionalcommits to v6 (<a
href="https://redirect.github.com/googleapis/release-please/issues/1974">#1974</a>)
(<a
href="https://github.com/googleapis/release-please/commit/1998564555c472f4eb850cdcec99a009dd76f8ca">1998564</a>)</li>
<li><strong>deps:</strong> Update dependency
conventional-changelog-writer to v6 (<a
href="https://redirect.github.com/googleapis/release-please/issues/1975">#1975</a>)
(<a
href="https://github.com/googleapis/release-please/commit/a6aa293932200dd004024b8c8f6b458c2fa8f570">a6aa293</a>)</li>
</ul>
<h2><a
href="https://github.com/googleapis/release-please/compare/v15.11.0...v15.11.1">15.11.1</a>
(2023-07-10)</h2>
<h3>Bug Fixes</h3>
<ul>
<li><strong>deps:</strong> Update dependency conventional-commits-filter
to v3 (<a
href="https://redirect.github.com/googleapis/release-please/issues/1976">#1976</a>)
(<a
href="https://github.com/googleapis/release-please/commit/20b8f345624f2a7e639df1a50ebda2719f9c2423">20b8f34</a>)</li>
<li><strong>python:</strong> Warn on dynamic pyproject.toml versioning
(<a
href="https://redirect.github.com/googleapis/release-please/issues/1983">#1983</a>)
(<a
href="https://github.com/googleapis/release-please/commit/5ee5baa0932d3435034b96183fed308eaf47ef73">5ee5baa</a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/googleapis/release-please/commit/e1b6a8936f23079f1f4ddf0c66a2aa85802e1a70"><code>e1b6a89</code></a>
chore(main): release 15.12.0 (<a
href="https://redirect.github.com/googleapis/release-please/issues/2012">#2012</a>)</li>
<li><a
href="https://github.com/googleapis/release-please/commit/b070888f25eff6e28c25014bcf67d6f9d47b9717"><code>b070888</code></a>
feat: add PrereleaseVersioningStrategy (<a
href="https://redirect.github.com/googleapis/release-please/issues/1981">#1981</a>)</li>
<li><a
href="https://github.com/googleapis/release-please/commit/b2de23be140fe3cfd846a1e5e2a45ebf4aefc469"><code>b2de23b</code></a>
chore(main): release 15.11.2 (<a
href="https://redirect.github.com/googleapis/release-please/issues/2010">#2010</a>)</li>
<li><a
href="https://github.com/googleapis/release-please/commit/1998564555c472f4eb850cdcec99a009dd76f8ca"><code>1998564</code></a>
fix(deps): update dependency conventional-changelog-conventionalcommits
to v6...</li>
<li><a
href="https://github.com/googleapis/release-please/commit/3e16c79208b3e03d49d8f4c43de4c0b10073aa5c"><code>3e16c79</code></a>
docs: update README.md to note that cargo workspaces need a manifest
driven r...</li>
<li><a
href="https://github.com/googleapis/release-please/commit/a6aa293932200dd004024b8c8f6b458c2fa8f570"><code>a6aa293</code></a>
fix(deps): update dependency conventional-changelog-writer to v6 (<a
href="https://redirect.github.com/googleapis/release-please/issues/1975">#1975</a>)</li>
<li><a
href="https://github.com/googleapis/release-please/commit/449ba39f419a20f1d984dee6714d70442658a495"><code>449ba39</code></a>
chore(deps): update dependency c8 to v8 (<a
href="https://redirect.github.com/googleapis/release-please/issues/1986">#1986</a>)</li>
<li><a
href="https://github.com/googleapis/release-please/commit/e298666a3c310d22cc0684285a136aa1d47444b5"><code>e298666</code></a>
chore(main): release 15.11.1 (<a
href="https://redirect.github.com/googleapis/release-please/issues/1996">#1996</a>)</li>
<li><a
href="https://github.com/googleapis/release-please/commit/5ee5baa0932d3435034b96183fed308eaf47ef73"><code>5ee5baa</code></a>
fix(python): warn on dynamic pyproject.toml versioning (<a
href="https://redirect.github.com/googleapis/release-please/issues/1983">#1983</a>)</li>
<li><a
href="https://github.com/googleapis/release-please/commit/4099f8a4173e2f3ed52907c859c3ecaa5bb55d82"><code>4099f8a</code></a>
build(deps): bump semver from 7.3.8 to 7.5.2 (<a
href="https://redirect.github.com/googleapis/release-please/issues/2009">#2009</a>)</li>
<li>Additional commits viewable in <a
href="https://github.com/googleapis/release-please/compare/v15.11.0...v15.12.0">compare
view</a></li>
</ul>
</details>
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