deps(deps): bump @astrojs/sitemap from 3.4.2 to 3.5.0

Bumps [@astrojs/sitemap](https://github.com/withastro/astro/tree/HEAD/packages/integrations/sitemap) from 3.4.2 to 3.5.0.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/withastro/astro/releases"><code>@​astrojs/sitemap</code>'s releases</a>.</em></p>
<blockquote>
<h2><code>@​astrojs/sitemap</code><a href="https://github.com/3"><code>@​3</code></a>.5.0</h2>
<h3>Minor Changes</h3>
<ul>
<li>
<p><a href="https://redirect.github.com/withastro/astro/pull/13682">#13682</a> <a href="https://github.com/withastro/astro/commit/5824b32c5cc5d58c1138e408a05d1be18924c711"><code>5824b32</code></a> Thanks <a href="https://github.com/gouravkhunger"><code>@​gouravkhunger</code></a>! - Adds a <code>customSitemaps</code> option to include extra sitemaps in the <code>sitemap-index.xml</code> file generated by Astro.</p>
<p>This is useful for multi-framework setups on the same domain as your Astro site (<code>example.com</code>), such as a blog at <code>example.com/blog</code> whose sitemap is generated by another framework.</p>
<p>The following example shows configuring your Astro site to include sitemaps for an externally-generated blog and help center along with the generated sitemap entries in <code>sitemap-index.xml</code>:</p>
<p>Example:</p>
<pre lang="js"><code>import { defineConfig } from 'astro/config';
import sitemap from '@astrojs/sitemap';
<p>export default defineConfig({
site: '<a href="https://example.com">https://example.com</a>',
integrations: [
sitemap({
customSitemaps: [
'https://example.com/blog/sitemap.xml',
'https://example.com/helpcenter/sitemap.xml',
],
}),
],
});
</code></pre></p>
<p>Learn more in the <a href="https://docs.astro.build/en/guides/integrations-guide/sitemap/#configuration"><code>@astrojs/sitemap</code> configuration documentation</a>.</p>
</li>
</ul>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/withastro/astro/blob/main/packages/integrations/sitemap/CHANGELOG.md"><code>@​astrojs/sitemap</code>'s changelog</a>.</em></p>
<blockquote>
<h2>3.5.0</h2>
<h3>Minor Changes</h3>
<ul>
<li>
<p><a href="https://redirect.github.com/withastro/astro/pull/13682">#13682</a> <a href="https://github.com/withastro/astro/commit/5824b32c5cc5d58c1138e408a05d1be18924c711"><code>5824b32</code></a> Thanks <a href="https://github.com/gouravkhunger"><code>@​gouravkhunger</code></a>! - Adds a <code>customSitemaps</code> option to include extra sitemaps in the <code>sitemap-index.xml</code> file generated by Astro.</p>
<p>This is useful for multi-framework setups on the same domain as your Astro site (<code>example.com</code>), such as a blog at <code>example.com/blog</code> whose sitemap is generated by another framework.</p>
<p>The following example shows configuring your Astro site to include sitemaps for an externally-generated blog and help center along with the generated sitemap entries in <code>sitemap-index.xml</code>:</p>
<p>Example:</p>
<pre lang="js"><code>import { defineConfig } from 'astro/config';
import sitemap from '@astrojs/sitemap';
<p>export default defineConfig({
site: '<a href="https://example.com">https://example.com</a>',
integrations: [
sitemap({
customSitemaps: [
'https://example.com/blog/sitemap.xml',
'https://example.com/helpcenter/sitemap.xml',
],
}),
],
});
</code></pre></p>
<p>Learn more in the <a href="https://docs.astro.build/en/guides/integrations-guide/sitemap/#configuration"><code>@astrojs/sitemap</code> configuration documentation</a>.</p>
</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/withastro/astro/commit/a186848c34615dab5816df3bd8962ba16314f2b9"><code>a186848</code></a> [ci] release (<a href="https://github.com/withastro/astro/tree/HEAD/packages/integrations/sitemap/issues/14217">#14217</a>)</li>
<li><a href="https://github.com/withastro/astro/commit/cad3cc65836b4e43fe420ebe0dbf1d54f8f28f36"><code>cad3cc6</code></a> [ci] format</li>
<li><a href="https://github.com/withastro/astro/commit/5824b32c5cc5d58c1138e408a05d1be18924c711"><code>5824b32</code></a> feat(<code>@​astro/sitemap</code>): custom sitemaps (<a href="https://github.com/withastro/astro/tree/HEAD/packages/integrations/sitemap/issues/13682">#13682</a>)</li>
<li>See full diff in <a href="https://github.com/withastro/astro/commits/@astrojs/sitemap@3.5.0/packages/integrations/sitemap">compare view</a></li>
</ul>
</details>
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