Log Message:
py-lxml: updated to 4.5.2

4.5.2
=====

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

* ``Cleaner()`` now validates that only known configuration options can be set.

* ``Cleaner.clean_html()`` discarded comments and PIs regardless of the
  corresponding configuration option, if ``remove_unknown_tags`` was set.

* Instead of globally overwriting the document loader in libxml2, lxml now
  sets it per parser run, which improves the interoperability with other users \ 
of libxml2
  such as libxmlsec.

* Fix build in CPython 3.10 by using Cython 0.29.21.

* The setup options "--with-xml2-config" and \ 
"--with-xslt-config" were accidentally renamed
  to "--xml2-config" and "--xslt-config" in 4.5.1 and are \ 
now available again.