Bump postcss from 8.5.21 to 8.5.22 in /ui (#3226)

Bumps [postcss](https://github.com/postcss/postcss) from 8.5.21 to
8.5.22.
<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>8.5.22</h2>
<ul>
<li>Fixed custom property losing semicolon before a comment (by <a
href="https://github.com/sarathfrancis90"><code>@​sarathfrancis90</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>8.5.22</h2>
<ul>
<li>Fixed custom property losing semicolon before a comment (by <a
href="https://github.com/sarathfrancis90"><code>@​sarathfrancis90</code></a>).</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/postcss/postcss/commit/a3e48c492ddec0e4879d513b8b995fee887af352"><code>a3e48c4</code></a>
Release 8.5.22 version</li>
<li><a
href="https://github.com/postcss/postcss/commit/f49d6911795f53b2cfe023bb686bf1144ec30618"><code>f49d691</code></a>
Fix custom property losing its semicolon before a comment (<a
href="https://redirect.github.com/postcss/postcss/issues/2117">#2117</a>)</li>
<li>See full diff in <a
href="https://github.com/postcss/postcss/compare/8.5.21...8.5.22">compare
view</a></li>
</ul>
</details>
<br />


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ui/yarn.lock

@@ -3749,9 +3749,9 @@ possible-typed-array-names@^1.0.0, possible-typed-array-names@^1.1.0:
   integrity sha512-/+5VFTchJDoVj3bhoqi6UeymcD00DAwb1nJwamzPvHEszJ4FpF6SNNbUbOS8yI56qHzdV8eK0qEfOSiodkTdxg==
 
 postcss@^8.5.17:
-  version "8.5.21"
-  resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.5.21.tgz#47a779bd831733ff620e608d233b195ee1e7d66c"
-  integrity sha512-v4sDNP3fdNiWMfabO7OwOQdOX8TiQSztKyT1Wj0w+j7LDallJThJRBBBmzVGyYj0crMh7jlV4zepPkiNu9UwDQ==
+  version "8.5.22"
+  resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.5.22.tgz#086a0d5685a715acf5950ebbcb1538faf3051697"
+  integrity sha512-KBDEIpLrvpv16pp3K0Fw+UCoZfopFjjgeB+0tA/aaThfEE74kKDLrgg603YvOWJyg3+WYtyq3xYsQWsIyZlPqQ==
   dependencies:
     nanoid "^3.3.16"
     picocolors "^1.1.1"