Bump lxml from 5.2.2 to 5.3.0 (#246)

Bumps [lxml](https://github.com/lxml/lxml) from 5.2.2 to 5.3.0.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/lxml/lxml/blob/master/CHANGES.txt">lxml's
changelog</a>.</em></p>
<blockquote>
<h1>5.3.0 (2024-08-10)</h1>
<h2>Features added</h2>
<ul>
<li>GH#421: Nested <code>CDATA</code> sections are no longer rejected
but split on output
to represent <code>]]&gt;</code> correctly.
Patch by Gertjan Klein.</li>
</ul>
<h2>Bugs fixed</h2>
<ul>
<li>
<p>LP#2060160: Attribute values serialised differently in
<code>xmlfile.element()</code> and <code>xmlfile.write()</code>.</p>
</li>
<li>
<p>LP#2058177: The ISO-Schematron implementation could fail on unknown
prefixes.
Patch by David Lakin.</p>
</li>
</ul>
<h2>Other changes</h2>
<ul>
<li>
<p>LP#2067707: The <code>strip_cdata</code> option in
<code>HTMLParser()</code> turned out to be useless and is now
deprecated.</p>
</li>
<li>
<p>Binary wheels use the library versions libxml2 2.12.9 and libxslt
1.1.42.</p>
</li>
<li>
<p>Windows binary wheels use the library versions libxml2 2.11.8 and
libxslt 1.1.39.</p>
</li>
<li>
<p>Built with Cython 3.0.11.</p>
</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/lxml/lxml/commit/475f4ab305d3b6eccb0520e9298a6cf829ffcf75"><code>475f4ab</code></a>
Update release date.</li>
<li><a
href="https://github.com/lxml/lxml/commit/e356a1e7e143c205f568dab698ea241013440e15"><code>e356a1e</code></a>
Build: Add some debug output.</li>
<li><a
href="https://github.com/lxml/lxml/commit/834568044ac34ae2fe5fef050a04993dc9b9629b"><code>8345680</code></a>
Build: Retry library downloads on failures.</li>
<li><a
href="https://github.com/lxml/lxml/commit/2fe6c909d496285d72d4b877c7db8c00fd6ad57e"><code>2fe6c90</code></a>
CI: Test oldest officially supported library versions again (the
slightly new...</li>
<li><a
href="https://github.com/lxml/lxml/commit/00335a143bc9f1a3cb77164746f7eedd14a2e750"><code>00335a1</code></a>
Build: Improve download regexes.</li>
<li><a
href="https://github.com/lxml/lxml/commit/f3da47db93990e43f574840a53efb5b6b0e4df10"><code>f3da47d</code></a>
Prepare release of lxml 5.3.0.</li>
<li><a
href="https://github.com/lxml/lxml/commit/311970356d8772122fc566742fa9c8b03677ec8f"><code>3119703</code></a>
Add missing global name to &quot;<strong>all</strong>&quot; in
lxml.etree.</li>
<li><a
href="https://github.com/lxml/lxml/commit/9de61805ade5f494f6abbfe98f3379895c1514e2"><code>9de6180</code></a>
Build: Upgrade cibuildwheel version also for the matrix setup.</li>
<li><a
href="https://github.com/lxml/lxml/commit/54e36cbfeafc4b24ffdf697f8bd979510f548ec4"><code>54e36cb</code></a>
Build: Upgrade libxslt to latest (1.1.42).</li>
<li><a
href="https://github.com/lxml/lxml/commit/d4f56eeb3866df23945c8bf26825ac9b4a65d255"><code>d4f56ee</code></a>
Build: Slightly increase the oldest libxslt version that we test against
to w...</li>
<li>Additional commits viewable in <a
href="https://github.com/lxml/lxml/compare/lxml-5.2.2...lxml-5.3.0">compare
view</a></li>
</ul>
</details>
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