Bump @actions/github from 6.0.1 to 9.0.0 (#262)

Bumps
[@actions/github](https://github.com/actions/toolkit/tree/HEAD/packages/github)
from 6.0.1 to 9.0.0.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/actions/toolkit/blob/main/packages/github/RELEASES.md"><code>@​actions/github</code>'s
changelog</a>.</em></p>
<blockquote>
<h3>9.0.0</h3>
<ul>
<li><strong>Breaking change</strong>: Package is now ESM-only
<ul>
<li>CommonJS consumers must use dynamic <code>import()</code> instead of
<code>require()</code></li>
<li>Example: <code>const { getOctokit, context } = await
import('@actions/github')</code></li>
</ul>
</li>
<li>Fix TypeScript compilation by migrating to ESM, enabling proper
imports from <code>@octokit/core/types</code></li>
</ul>
<h3>8.0.1</h3>
<ul>
<li>Update <code>undici</code> to <code>6.23.0</code></li>
<li>Update <code>@actions/http-client</code> to <code>3.0.2</code></li>
</ul>
<h3>8.0.0</h3>
<ul>
<li>Update <a
href="https://github.com/octokit"><code>@​octokit</code></a>
dependencies
<ul>
<li><code>@octokit/core</code> ^7.0.6</li>
<li><code>@octokit/plugin-paginate-rest</code> ^14.0.0</li>
<li><code>@octokit/plugin-rest-endpoint-methods</code> ^17.0.0</li>
<li><code>@octokit/request</code> ^10.0.7</li>
<li><code>@octokit/request-error</code> ^7.1.0</li>
</ul>
</li>
<li><strong>Breaking change</strong>: Minimum Node.js version is now 20
(previously 18)</li>
</ul>
<h3>7.0.0</h3>
<ul>
<li>Update to v3.0.1 of <code>@actions/http-client</code></li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li>See full diff in <a
href="https://github.com/actions/toolkit/commits/HEAD/packages/github">compare
view</a></li>
</ul>
</details>
<details>
<summary>Maintainer changes</summary>
<p>This version was pushed to npm by [GitHub Actions](<a
href="https://www.npmjs.com/~GitHub">https://www.npmjs.com/~GitHub</a>
Actions), a new releaser for <code>@​actions/github</code> since your
current version.</p>
</details>
<br />


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