Bump postcss from 8.4.48 to 8.4.49 (#12906)

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.48 to
8.4.49.
<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>8.4.49</h2>
<ul>
<li>Fixed custom syntax without <code>source.offset</code> (by <a
href="https://github.com/romainmenke"><code>@​romainmenke</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>8.4.49</h2>
<ul>
<li>Fixed custom syntax without <code>source.offset</code> (by <a
href="https://github.com/romainmenke"><code>@​romainmenke</code></a>).</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/postcss/postcss/commit/aed8b899884db4bc89f60782771eecd8c7861b32"><code>aed8b89</code></a>
Release 8.4.49 version</li>
<li><a
href="https://github.com/postcss/postcss/commit/345063010bf5a9724589a9ee420bd511ec2b12bf"><code>3450630</code></a>
Fix position calculations when offset is missing (<a
href="https://redirect.github.com/postcss/postcss/issues/1983">#1983</a>)</li>
<li>See full diff in <a
href="https://github.com/postcss/postcss/compare/8.4.48...8.4.49">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]