deps(deps): bump astro from 5.16.3 to 5.16.4

Bumps [astro](https://github.com/withastro/astro/tree/HEAD/packages/astro) from 5.16.3 to 5.16.4.
<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>astro@5.16.4</h2>
<h3>Patch Changes</h3>
<ul>
<li>
<p><a href="https://redirect.github.com/withastro/astro/pull/14940">#14940</a> <a href="https://github.com/withastro/astro/commit/2cf79c23c23e3364b0e6a86394b6584112786c5b"><code>2cf79c2</code></a> Thanks <a href="https://github.com/ematipico"><code>@​ematipico</code></a>! - Fixes a bug where Astro didn't properly combine CSP resources from the <code>csp</code> configuration with those added using the runtime API (<code>Astro.csp.insertDirective()</code>) to form grammatically correct CSP headers</p>
<p>Now Astro correctly deduplicate CSP resources. For example, if you have a global resource in the configuration file, and then you add a
a new one using the runtime APIs.</p>
</li>
</ul>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/withastro/astro/blob/main/packages/astro/CHANGELOG.md">astro's changelog</a>.</em></p>
<blockquote>
<h2>5.16.4</h2>
<h3>Patch Changes</h3>
<ul>
<li>
<p><a href="https://redirect.github.com/withastro/astro/pull/14940">#14940</a> <a href="https://github.com/withastro/astro/commit/2cf79c23c23e3364b0e6a86394b6584112786c5b"><code>2cf79c2</code></a> Thanks <a href="https://github.com/ematipico"><code>@​ematipico</code></a>! - Fixes a bug where Astro didn't properly combine CSP resources from the <code>csp</code> configuration with those added using the runtime API (<code>Astro.csp.insertDirective()</code>) to form grammatically correct CSP headers</p>
<p>Now Astro correctly deduplicate CSP resources. For example, if you have a global resource in the configuration file, and then you add a
a new one using the runtime APIs.</p>
</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/withastro/astro/commit/141c676df141d805aecad290c2417ff5951a0573"><code>141c676</code></a> [ci] release (<a href="https://github.com/withastro/astro/tree/HEAD/packages/astro/issues/14930">#14930</a>)</li>
<li><a href="https://github.com/withastro/astro/commit/d9a43e12e0880870b9cacc01e9adcf82bd7fec06"><code>d9a43e1</code></a> [ci] format</li>
<li><a href="https://github.com/withastro/astro/commit/2cf79c23c23e3364b0e6a86394b6584112786c5b"><code>2cf79c2</code></a> fix(csp): deduplicate CSP resources (<a href="https://github.com/withastro/astro/tree/HEAD/packages/astro/issues/14940">#14940</a>)</li>
<li><a href="https://github.com/withastro/astro/commit/c8ac8e5eed7fa8db7111878ada787243cedc09b7"><code>c8ac8e5</code></a> chore(fonts): classes (<a href="https://github.com/withastro/astro/tree/HEAD/packages/astro/issues/14920">#14920</a>)</li>
<li>See full diff in <a href="https://github.com/withastro/astro/commits/astro@5.16.4/packages/astro">compare view</a></li>
</ul>
</details>
<br />


[](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 show <dependency name> ignore conditions` will show all of the ignore conditions of the specified dependency
- `@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>