Bump autoprefixer from 10.4.20 to 10.4.21 (#302)

Bumps [autoprefixer](https://github.com/postcss/autoprefixer) from
10.4.20 to 10.4.21.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/postcss/autoprefixer/releases">autoprefixer's
releases</a>.</em></p>
<blockquote>
<h2>10.4.21</h2>
<ul>
<li>Fixed old <code>-moz-</code> prefix for
<code>:placeholder-shown</code> (by <a
href="https://github.com/Marukome0743"><code>@​Marukome0743</code></a>).</li>
</ul>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/postcss/autoprefixer/blob/main/CHANGELOG.md">autoprefixer's
changelog</a>.</em></p>
<blockquote>
<h2>10.4.21</h2>
<ul>
<li>Fixed old <code>-moz-</code> prefix for
<code>:placeholder-shown</code> (by <a
href="https://github.com/Marukome0743"><code>@​Marukome0743</code></a>).</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/postcss/autoprefixer/commit/541295c0e6dd348db2d3f52772b59cd403c59d29"><code>541295c</code></a>
Release 10.4.21 version</li>
<li><a
href="https://github.com/postcss/autoprefixer/commit/8d555f7e5e665d6a70e1d08db6e0bc9c4262db66"><code>8d555f7</code></a>
Update dependencies and sort imports</li>
<li><a
href="https://github.com/postcss/autoprefixer/commit/5c2421e82af45ee085d0806110fcef66bbebe59b"><code>5c2421e</code></a>
Update Node.js and pnpm on CI</li>
<li><a
href="https://github.com/postcss/autoprefixer/commit/af9cb5f365f66bf5169f1f42e08036651453b1a6"><code>af9cb5f</code></a>
fix: replace <code>:-moz-placeholder-shown</code> with
<code>:-moz-placeholder</code> (<a
href="https://redirect.github.com/postcss/autoprefixer/issues/1532">#1532</a>)</li>
<li>See full diff in <a
href="https://github.com/postcss/autoprefixer/compare/10.4.20...10.4.21">compare
view</a></li>
</ul>
</details>
<br />


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package-lock.json

@@ -19,7 +19,7 @@
     "@types/react-dom": "19.0.3",
     "@types/react-icons": "^2.2.7",
     "@types/react-scroll": "1.8.10",
-    "autoprefixer": "^10.4.20",
+    "autoprefixer": "^10.4.21",
     "postcss": "^8.5.3",
     "postcss-import": "^16.1.0",
     "postcss-loader": "^8.1.1",