chore(deps-dev): Bump postcss from 8.5.28 to 8.5.29 (#2215)

Bumps [postcss](https://github.com/postcss/postcss) from 8.5.28 to
8.5.29.
<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>8.5.29</h2>
<ul>
<li>Improved <code>&lt;/style&gt;</code> escaping (by <a
href="https://github.com/choudhryfrompak"><code>@​choudhryfrompak</code></a>).</li>
<li>Fixed comments support in <code>list.comma()</code> and
<code>list.space()</code> (by <a
href="https://github.com/00200200"><code>@​00200200</code></a>).</li>
<li>Fixed semicolon and custom property (by <a
href="https://github.com/wahidrizka"><code>@​wahidrizka</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>8.5.29</h2>
<ul>
<li>Improved <code>&lt;/style&gt;</code> escaping (by <a
href="https://github.com/choudhryfrompak"><code>@​choudhryfrompak</code></a>).</li>
<li>Fixed comments support in <code>list.comma()</code> and
<code>list.space()</code> (by <a
href="https://github.com/00200200"><code>@​00200200</code></a>).</li>
<li>Fixed semicolon and custom property (by <a
href="https://github.com/wahidrizka"><code>@​wahidrizka</code></a>).</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/postcss/postcss/commit/a7a1f3476177d689dff722d3f9f72190ddf93f7e"><code>a7a1f34</code></a>
Release 8.5.29 version</li>
<li><a
href="https://github.com/postcss/postcss/commit/b55a36d14670cefa838b59a9b68c035b9619e294"><code>b55a36d</code></a>
Update dependencies</li>
<li><a
href="https://github.com/postcss/postcss/commit/7647a8107ebac8014f1a29ec7e06d3f6ab7c8ac6"><code>7647a81</code></a>
Escape &lt;/style&gt; in output of non-Root nodes (<a
href="https://redirect.github.com/postcss/postcss/issues/2163">#2163</a>)</li>
<li><a
href="https://github.com/postcss/postcss/commit/7ac902664902289ea0cb9d6b1096b81e8d33bbf5"><code>7ac9026</code></a>
Do not split list.comma() and list.space() on separators inside comments
(<a
href="https://redirect.github.com/postcss/postcss/issues/2162">#2162</a>)</li>
<li><a
href="https://github.com/postcss/postcss/commit/ebffa97faa305f781a7df5a41ec39f57966b7b6c"><code>ebffa97</code></a>
Add postcss-smooth-corners plugin</li>
<li><a
href="https://github.com/postcss/postcss/commit/57d6401ccca6ce96c9fcdebbdfc30c1ce9e7e797"><code>57d6401</code></a>
Speed up source map cleaning</li>
<li><a
href="https://github.com/postcss/postcss/commit/7e46a036aa55c16b99bf4620850267e3407797ca"><code>7e46a03</code></a>
Speed up parser</li>
<li><a
href="https://github.com/postcss/postcss/commit/7f5c417f1d2dfd3280bb552191dac64a7ffd93d8"><code>7f5c417</code></a>
Improve &lt;/style&gt; protection for the case when beffore nodes have
different parts</li>
<li><a
href="https://github.com/postcss/postcss/commit/7ba9051fb22d5b5ab160d71c3f2b749557c8ac6f"><code>7ba9051</code></a>
Fix useless ESLint warning</li>
<li><a
href="https://github.com/postcss/postcss/commit/12b41616d99877145dbd209cb17c339aedb556f9"><code>12b4161</code></a>
Update dependencies</li>
<li>Additional commits viewable in <a
href="https://github.com/postcss/postcss/compare/8.5.28...8.5.29">compare
view</a></li>
</ul>
</details>
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package.json

@@ -136,7 +136,7 @@
     "istanbul": "^0.4.5",
     "istanbul-lib-coverage": "^3.2.2",
     "nyc": "^18.0.0",
-    "postcss": "^8.5.28",
+    "postcss": "^8.5.29",
     "react-hot-loader": "^4.13.1",
     "sass": "^1.105.1",
     "stylelint": "^17.16.0",