Bump postcss from 8.5.4 to 8.5.5 (#13780)

Bumps [postcss](https://github.com/postcss/postcss) from 8.5.4 to 8.5.5.
<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>8.5.5</h2>
<ul>
<li>Fixed <code>package.json</code>→<code>exports</code> compatibility
with some tools (by <a
href="https://github.com/JounQin"><code>@​JounQin</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>8.5.5</h2>
<ul>
<li>Fixed <code>package.json</code>→<code>exports</code> compatibility
with some tools (by <a
href="https://github.com/JounQin"><code>@​JounQin</code></a>).</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/postcss/postcss/commit/c18159719e4a6d65ad7085edf1dc42e07814f683"><code>c181597</code></a>
Release 8.5.5 version</li>
<li><a
href="https://github.com/postcss/postcss/commit/c5523fbec5f32622e77103c643e1258007c2609d"><code>c5523fb</code></a>
Update dependencies</li>
<li><a
href="https://github.com/postcss/postcss/commit/2e3450c55f41e378e086f4f189e5243a573c3390"><code>2e3450c</code></a>
refactor: <code>import</code> should be listed before
<code>require</code> (<a
href="https://redirect.github.com/postcss/postcss/issues/2052">#2052</a>)</li>
<li><a
href="https://github.com/postcss/postcss/commit/4d720bd01adec2e8645bf91e725825bebb712e1b"><code>4d720bd</code></a>
Update EM text</li>
<li>See full diff in <a
href="https://github.com/postcss/postcss/compare/8.5.4...8.5.5">compare
view</a></li>
</ul>
</details>
<br />


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Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]