deps(example): bump postcss from 8.5.0 to 8.5.1 in /examples/nextjs-1…

…4-nextauth-4 in the dependencies group (#2835)

Bumps the dependencies group in /examples/nextjs-14-nextauth-4 with 1 update: [postcss](https://github.com/postcss/postcss).

Updates `postcss` from 8.5.0 to 8.5.1
<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>8.5.1</h2>
<ul>
<li>Fixed backwards compatibility for complex cases (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>8.5.1</h2>
<ul>
<li>Fixed backwards compatibility for complex cases (by <a href="https://github.com/romainmenke"><code>@​romainmenke</code></a>).</li>
</ul>
<h2>8.5 “Duke Alloces”</h2>
<ul>
<li>Added <code>Input#document</code> for sources like CSS-in-JS or HTML (by <a href="https://github.com/romainmenke"><code>@​romainmenke</code></a>).</li>
</ul>
<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>
<h2>8.4.48</h2>
<ul>
<li>Fixed position calculation in error/warnings methods (by <a href="https://github.com/romainmenke"><code>@​romainmenke</code></a>).</li>
</ul>
<h2>8.4.47</h2>
<ul>
<li>Removed debug code.</li>
</ul>
<h2>8.4.46</h2>
<ul>
<li>Fixed <code>Cannot read properties of undefined (reading 'before')</code>.</li>
</ul>
<h2>8.4.45</h2>
<ul>
<li>Removed unnecessary fix which could lead to infinite loop.</li>
</ul>
<h2>8.4.44</h2>
<ul>
<li>Another way to fix <code>markClean is not a function</code> error.</li>
</ul>
<h2>8.4.43</h2>
<ul>
<li>Fixed <code>markClean is not a function</code> error.</li>
</ul>
<h2>8.4.42</h2>
<ul>
<li>Fixed CSS syntax error on long minified files (by <a href="https://github.com/varpstar"><code>@​varpstar</code></a>).</li>
</ul>
<h2>8.4.41</h2>
<ul>
<li>Fixed types (by <a href="https://github.com/nex3"><code>@​nex3</code></a> and <a href="https://github.com/querkmachine"><code>@​querkmachine</code></a>).</li>
<li>Cleaned up RegExps (by <a href="https://github.com/bluwy"><code>@​bluwy</code></a>).</li>
</ul>
<h2>8.4.40</h2>
<ul>
<li>Moved to getter/setter in nodes types to help Sass team (by <a href="https://github.com/nex3"><code>@​nex3</code></a>).</li>
</ul>
<h2>8.4.39</h2>
<ul>
<li>Fixed <code>CssSyntaxError</code> types (by <a href="https://github.com/romainmenke"><code>@​romainmenke</code></a>).</li>
</ul>
<h2>8.4.38</h2>
<ul>
<li>Fixed <code>endIndex: 0</code> in errors and warnings (by <a href="https://github.com/romainmenke"><code>@​romainmenke</code></a>).</li>
</ul>
<h2>8.4.37</h2>
<ul>
<li>Fixed <code>original.column are not numbers</code> error in another case.</li>
</ul>
<h2>8.4.36</h2>
<ul>
<li>Fixed <code>original.column are not numbers</code> error on broken previous source map.</li>
</ul>
<h2>8.4.35</h2>
<!-- raw HTML omitted -->
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/postcss/postcss/commit/7b02c75e5f093b3fdf8d46eeb17c21a52434d827"><code>7b02c75</code></a> Release 8.5.1 version</li>
<li><a href="https://github.com/postcss/postcss/commit/4c15339f9fa7cb76eaf513b34846b1d6d0635871"><code>4c15339</code></a> Update dependencies</li>
<li><a href="https://github.com/postcss/postcss/commit/7efe91eeb9111e297fd6e62b129ec4a2b9b46e56"><code>7efe91e</code></a> Improve backwards compat for <code>Input#document</code> (<a href="https://redirect.github.com/postcss/postcss/issues/2000">#2000</a>)</li>
<li>See full diff in <a href="https://github.com/postcss/postcss/compare/8.5.0...8.5.1">compare view</a></li>
</ul>
</details>
<br />


[![Dependabot compatibility score](https://dependabot-badges.githubapp.com/badges/compatibility_score?dependency-name=postcss&package-manager=npm_and_yarn&previous-version=8.5.0&new-version=8.5.1)](https://docs.github.com/en/github/managing-security-vulnerabilities/about-dependabot-security-updates#about-compatibility-scores)

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</details>