Log Message:
py-lxml: update to 5.3.0.

5.3.0 (2024-08-10)
==================

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

* GH#421: Nested ``CDATA`` sections are no longer rejected but split on output
  to represent ``]]>`` correctly.
  Patch by Gertjan Klein.

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

* LP#2060160: Attribute values serialised differently in ``xmlfile.element()`` \ 
and ``xmlfile.write()``.

* LP#2058177: The ISO-Schematron implementation could fail on unknown prefixes.
  Patch by David Lakin.

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

* LP#2067707: 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.