Bump astro from 5.17.1 to 5.18.0 in /website in the dependabot group (#321)

Bumps the dependabot group in /website with 1 update:
[astro](https://github.com/withastro/astro/tree/HEAD/packages/astro).

Updates `astro` from 5.17.1 to 5.18.0
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/withastro/astro/releases">astro's
releases</a>.</em></p>
<blockquote>
<h2>[email protected]</h2>
<h3>Minor Changes</h3>
<ul>
<li>
<p><a
href="https://redirect.github.com/withastro/astro/pull/15589">#15589</a>
<a
href="https://github.com/withastro/astro/commit/b7dd447e319a7b435c01ccd69347e5261bd9dc14"><code>b7dd447</code></a>
Thanks <a href="https://github.com/qzio"><code>@​qzio</code></a>! - Adds
a new <code>security.actionBodySizeLimit</code> option to configure the
maximum size of Astro Actions request bodies.</p>
<p>This lets you increase the default 1 MB limit when your actions need
to accept larger payloads. For example, actions that handle file uploads
or large JSON payloads can now opt in to a higher limit.</p>
<p>If you do not set this option, Astro continues to enforce the 1 MB
default to help prevent abuse.</p>
<pre lang="js"><code>// astro.config.mjs
export default defineConfig({
  security: {
    actionBodySizeLimit: 10 * 1024 * 1024, // set to 10 MB
  },
});
</code></pre>
</li>
</ul>
<h3>Patch Changes</h3>
<ul>
<li><a
href="https://redirect.github.com/withastro/astro/pull/15594">#15594</a>
<a
href="https://github.com/withastro/astro/commit/efae11cef1ebe1f2f54ceb55db0d1ff1938351c6"><code>efae11c</code></a>
Thanks <a href="https://github.com/qzio"><code>@​qzio</code></a>! - Fix
X-Forwarded-Proto validation when allowedDomains includes both protocol
and hostname fields. The protocol check no longer fails due to hostname
mismatch against the hardcoded test URL.</li>
</ul>
<h2>[email protected]</h2>
<h3>Patch Changes</h3>
<ul>
<li>
<p><a
href="https://redirect.github.com/withastro/astro/pull/15564">#15564</a>
<a
href="https://github.com/withastro/astro/commit/522f880b07a4ea7d69a19b5507fb53a5ed6c87f8"><code>522f880</code></a>
Thanks <a
href="https://github.com/matthewp"><code>@​matthewp</code></a>! - Add a
default body size limit for server actions to prevent oversized requests
from exhausting memory.</p>
</li>
<li>
<p><a
href="https://redirect.github.com/withastro/astro/pull/15569">#15569</a>
<a
href="https://github.com/withastro/astro/commit/e01e98b063e90d274c42130ec2a60cc0966622c9"><code>e01e98b</code></a>
Thanks <a
href="https://github.com/matthewp"><code>@​matthewp</code></a>! -
Respect image allowlists when inferring remote image sizes and reject
remote redirects.</p>
</li>
</ul>
<h2>[email protected]</h2>
<h3>Patch Changes</h3>
<ul>
<li><a
href="https://github.com/withastro/astro/commit/c13b536197a70d8d4fd0037c5bd3aaa2be0598b9"><code>c13b536</code></a>
Thanks <a
href="https://github.com/matthewp"><code>@​matthewp</code></a>! -
Improves Host header handling for SSR deployments behind proxies</li>
</ul>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/withastro/astro/blob/[email protected]/packages/astro/CHANGELOG.md">astro's
changelog</a>.</em></p>
<blockquote>
<h2>5.18.0</h2>
<h3>Minor Changes</h3>
<ul>
<li>
<p><a
href="https://redirect.github.com/withastro/astro/pull/15589">#15589</a>
<a
href="https://github.com/withastro/astro/commit/b7dd447e319a7b435c01ccd69347e5261bd9dc14"><code>b7dd447</code></a>
Thanks <a href="https://github.com/qzio"><code>@​qzio</code></a>! - Adds
a new <code>security.actionBodySizeLimit</code> option to configure the
maximum size of Astro Actions request bodies.</p>
<p>This lets you increase the default 1 MB limit when your actions need
to accept larger payloads. For example, actions that handle file uploads
or large JSON payloads can now opt in to a higher limit.</p>
<p>If you do not set this option, Astro continues to enforce the 1 MB
default to help prevent abuse.</p>
<pre lang="js"><code>// astro.config.mjs
export default defineConfig({
  security: {
    actionBodySizeLimit: 10 * 1024 * 1024, // set to 10 MB
  },
});
</code></pre>
</li>
</ul>
<h3>Patch Changes</h3>
<ul>
<li><a
href="https://redirect.github.com/withastro/astro/pull/15594">#15594</a>
<a
href="https://github.com/withastro/astro/commit/efae11cef1ebe1f2f54ceb55db0d1ff1938351c6"><code>efae11c</code></a>
Thanks <a href="https://github.com/qzio"><code>@​qzio</code></a>! - Fix
X-Forwarded-Proto validation when allowedDomains includes both protocol
and hostname fields. The protocol check no longer fails due to hostname
mismatch against the hardcoded test URL.</li>
</ul>
<h2>5.17.3</h2>
<h3>Patch Changes</h3>
<ul>
<li>
<p><a
href="https://redirect.github.com/withastro/astro/pull/15564">#15564</a>
<a
href="https://github.com/withastro/astro/commit/522f880b07a4ea7d69a19b5507fb53a5ed6c87f8"><code>522f880</code></a>
Thanks <a
href="https://github.com/matthewp"><code>@​matthewp</code></a>! - Add a
default body size limit for server actions to prevent oversized requests
from exhausting memory.</p>
</li>
<li>
<p><a
href="https://redirect.github.com/withastro/astro/pull/15569">#15569</a>
<a
href="https://github.com/withastro/astro/commit/e01e98b063e90d274c42130ec2a60cc0966622c9"><code>e01e98b</code></a>
Thanks <a
href="https://github.com/matthewp"><code>@​matthewp</code></a>! -
Respect image allowlists when inferring remote image sizes and reject
remote redirects.</p>
</li>
</ul>
<h2>5.17.2</h2>
<h3>Patch Changes</h3>
<ul>
<li><a
href="https://github.com/withastro/astro/commit/c13b536197a70d8d4fd0037c5bd3aaa2be0598b9"><code>c13b536</code></a>
Thanks <a
href="https://github.com/matthewp"><code>@​matthewp</code></a>! -
Improves Host header handling for SSR deployments behind proxies</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/withastro/astro/commit/011f06106531419f27ce53d0641a3e6ef9db5108"><code>011f061</code></a>
[ci] release (<a
href="https://github.com/withastro/astro/tree/HEAD/packages/astro/issues/15597">#15597</a>)</li>
<li><a
href="https://github.com/withastro/astro/commit/efae11cef1ebe1f2f54ceb55db0d1ff1938351c6"><code>efae11c</code></a>
fix: X-Forwarded-Proto rejected when allowedDomains includes protocol…
(<a
href="https://github.com/withastro/astro/tree/HEAD/packages/astro/issues/15594">#15594</a>)</li>
<li><a
href="https://github.com/withastro/astro/commit/751ccf06fab3f1f8e157873354f91f7282a5a1ca"><code>751ccf0</code></a>
Update actionBodySizeLimit changeset and make minor (<a
href="https://github.com/withastro/astro/tree/HEAD/packages/astro/issues/15600">#15600</a>)</li>
<li><a
href="https://github.com/withastro/astro/commit/b7dd447e319a7b435c01ccd69347e5261bd9dc14"><code>b7dd447</code></a>
make actionBodySizeLimit configurable (<a
href="https://github.com/withastro/astro/tree/HEAD/packages/astro/issues/15589">#15589</a>)</li>
<li><a
href="https://github.com/withastro/astro/commit/e0f1a2b3e4bc908bd5e148c698efb6f41a42c8ea"><code>e0f1a2b</code></a>
[ci] release (<a
href="https://github.com/withastro/astro/tree/HEAD/packages/astro/issues/15571">#15571</a>)</li>
<li><a
href="https://github.com/withastro/astro/commit/522f880b07a4ea7d69a19b5507fb53a5ed6c87f8"><code>522f880</code></a>
Limit action request body size (<a
href="https://github.com/withastro/astro/tree/HEAD/packages/astro/issues/15564">#15564</a>)</li>
<li><a
href="https://github.com/withastro/astro/commit/436962a639ad7d606ed19c97b42d2466117e3fc4"><code>436962a</code></a>
chore: Upgrade Vite and esbuild (<a
href="https://github.com/withastro/astro/tree/HEAD/packages/astro/issues/15554">#15554</a>)</li>
<li><a
href="https://github.com/withastro/astro/commit/e01e98b063e90d274c42130ec2a60cc0966622c9"><code>e01e98b</code></a>
Respect remote image allowlists (<a
href="https://github.com/withastro/astro/tree/HEAD/packages/astro/issues/15569">#15569</a>)</li>
<li><a
href="https://github.com/withastro/astro/commit/f2955fbc0ebc14a6d04083287b50a769707b3d64"><code>f2955fb</code></a>
[ci] release (<a
href="https://github.com/withastro/astro/tree/HEAD/packages/astro/issues/15474">#15474</a>)</li>
<li><a
href="https://github.com/withastro/astro/commit/c13b536197a70d8d4fd0037c5bd3aaa2be0598b9"><code>c13b536</code></a>
Validate Host header against allowedDomains</li>
<li>Additional commits viewable in <a
href="https://github.com/withastro/astro/commits/[email protected]/packages/astro">compare
view</a></li>
</ul>
</details>
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