Update lxml to 5.3.0

[pyup-bot]

This PR updates lxml from 5.2.1 to 5.3.0.

Changelog

5.3.0

==================

Features added
--------------

* GH421: Nested ``CDATA`` sections are no longer rejected but split on output
to represent ``]]>`` correctly.
Patch by Gertjan Klein.

Bugs fixed
----------

* LP2060160: Attribute values serialised differently in ``xmlfile.element()`` and ``xmlfile.write()``.

* LP2058177: The ISO-Schematron implementation could fail on unknown prefixes.
Patch by David Lakin.

Other changes
-------------

* LP2067707: The ``strip_cdata`` option in ``HTMLParser()`` turned out to be useless and is now deprecated.

* Binary wheels use the library versions libxml2 2.12.9 and libxslt 1.1.42.

* Windows binary wheels use the library versions libxml2 2.11.8 and libxslt 1.1.39.

* Built with Cython 3.0.11.

5.2.2

==================

Bugs fixed
----------

* GH417: The ``test_feed_parser`` test could fail if ``lxml_html_clean`` was not installed.
It is now skipped in that case.

* LP2059910: The minimum CPU architecture for the Linux x86 binary wheels was set back to
"core2", without SSE 4.2.

* If libxml2 uses iconv, the compile time version is available as `etree.ICONV_COMPILED_VERSION`.

Links

• PyPI: https://pypi.org/project/lxml
• Changelog: https://data.safetycli.com/changelogs/lxml/
• Homepage: https://lxml.de/