deps(deps): bump @astrojs/mdx from 4.3.11 to 4.3.12

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Bumps [@astrojs/mdx](https://github.com/withastro/astro/tree/HEAD/packages/integrations/mdx) from 4.3.11 to 4.3.12.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/withastro/astro/releases"><code>@​astrojs/mdx</code>'s releases</a>.</em></p>
<blockquote>
<h2><code>@​astrojs/mdx</code><a href="https://github.com/4"><code>@​4</code></a>.3.12</h2>
<h3>Patch Changes</h3>
<ul>
<li><a href="https://redirect.github.com/withastro/astro/pull/14813">#14813</a> <a href="https://github.com/withastro/astro/commit/e1dd377398a3dcf6ba0697dc8d4bde6d77a45700"><code>e1dd377</code></a> Thanks <a href="https://github.com/ematipico"><code>@​ematipico</code></a>! - Removes <code>picocolors</code> as dependency in favor of the fork <code>piccolore</code>.</li>
</ul>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/withastro/astro/blob/main/packages/integrations/mdx/CHANGELOG.md"><code>@​astrojs/mdx</code>'s changelog</a>.</em></p>
<blockquote>
<h2>4.3.12</h2>
<h3>Patch Changes</h3>
<ul>
<li><a href="https://redirect.github.com/withastro/astro/pull/14813">#14813</a> <a href="https://github.com/withastro/astro/commit/e1dd377398a3dcf6ba0697dc8d4bde6d77a45700"><code>e1dd377</code></a> Thanks <a href="https://github.com/ematipico"><code>@​ematipico</code></a>! - Removes <code>picocolors</code> as dependency in favor of the fork <code>piccolore</code>.</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/withastro/astro/commit/e8786795fc462374d44917dd8eb6effcd6939257"><code>e878679</code></a> [ci] release (<a href="https://github.com/withastro/astro/tree/HEAD/packages/integrations/mdx/issues/14808">#14808</a>)</li>
<li><a href="https://github.com/withastro/astro/commit/e1dd377398a3dcf6ba0697dc8d4bde6d77a45700"><code>e1dd377</code></a> fix: remove picocolors (<a href="https://github.com/withastro/astro/tree/HEAD/packages/integrations/mdx/issues/14813">#14813</a>)</li>
<li>See full diff in <a href="https://github.com/withastro/astro/commits/@astrojs/mdx@4.3.12/packages/integrations/mdx">compare view</a></li>
</ul>
</details>
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