fix: bump postcss from 8.5.30 to 8.5.31 in the minor group (#1403)

Bumps the minor group with 1 update:
[postcss](https://github.com/postcss/postcss).

Updates `postcss` from 8.5.30 to 8.5.31
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/postcss/postcss/releases">postcss's
releases</a>.</em></p>
<blockquote>
<h2>8.5.31</h2>
<ul>
<li>Fix better source map on <code>&lt;/style&gt;</code> escaping (by <a
href="https://github.com/firefoxic"><code>@​firefoxic</code></a>).</li>
</ul>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/postcss/postcss/blob/main/CHANGELOG.md">postcss's
changelog</a>.</em></p>
<blockquote>
<h2>8.5.31</h2>
<ul>
<li>Fix better source map on <code>&lt;/style&gt;</code> escaping (by <a
href="https://github.com/firefoxic"><code>@​firefoxic</code></a>).</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="d1908579d6"><code>d190857</code></a>
Release 8.5.31 version</li>
<li><a
href="4ef6d8cc03"><code>4ef6d8c</code></a>
Update dependencies</li>
<li><a
href="6abd674231"><code>6abd674</code></a>
Call the builder with every node when the output is escaped (<a
href="https://redirect.github.com/postcss/postcss/issues/2175">#2175</a>)</li>
<li>See full diff in <a
href="https://github.com/postcss/postcss/compare/8.5.30...8.5.31">compare
view</a></li>
</ul>
</details>
<br />


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package-lock.json

@@ -3146,9 +3146,9 @@
       }
     },
     "node_modules/postcss": {
-      "version": "8.5.30",
+      "version": "8.5.31",
-      "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.5.30.tgz",
+      "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.5.31.tgz",
-      "integrity": "sha512-zkd+e9S1AQHhmaBKye9zlFHWjOwVgqXl1q3ECYy8561K7qxR2cREf/STLskulBFd78k6AOFeA+ff1TtEzk9bAA==",
+      "integrity": "sha512-YUbWYCgErwnMAVkjUnYa+KlMBzGpHwiIt/DE7f0G33AuX2LH9UcTk6KgWxd3zRU+pN3u/C+Xl3EnMLM4Hea7Sg==",
       "dev": true,
       "funding": [
         {