python3-lxml: upgrade 5.2.2 -> 5.3.0

Changelog:
===========
* GH#421: Nested "CDATA" sections are no longer rejected but split on
  output to represent "]]>" correctly.
* LP#2060160: Attribute values serialised differently in "xmlfile.element()"
  and "xmlfile.write()".
* LP#2058177: The ISO-Schematron implementation could fail on unknown prefixes.
* 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.

Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>