Update dependency lxml to v4.8.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
lxml (source, changelog)	==4.6.5 -> ==4.8.0

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Release Notes

lxml/lxml

v4.8.0

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Features added

• GH#​337: Path-like objects are now supported throughout the API instead of just strings.
  Patch by Henning Janssen.

• The ElementMaker now supports QName values as tags, which always override
  the default namespace of the factory.

Bugs fixed

• GH#​338: In lxml.objectify, the XSI float annotation "nan" and "inf" were spelled in
  lower case, whereas XML Schema datatypes define them as "NaN" and "INF" respectively.
  Patch by Tobias Deiminger.

Other changes

• Built with Cython 0.29.28.

v4.7.1

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Features added

• Chunked Unicode string parsing via parser.feed() now encodes the input data
  to the native UTF-8 encoding directly, instead of going through Py_UNICODE /
  wchar_t encoding first, which previously required duplicate recoding in most cases.

Bugs fixed

• The standard namespace prefixes were mishandled during "C14N2" serialisation on Python 3.
  See https://mail.python.org/archives/list/[email protected]/thread/6ZFBHFOVHOS5GFDOAMPCT6HM5HZPWQ4Q/

• lxml.objectify previously accepted non-XML numbers with underscores (like "1_000")
  as integers or float values in Python 3.6 and later. It now adheres to the number
  format of the XML spec again.

• LP#​1939031: Static wheels of lxml now contain the header files of zlib and libiconv
  (in addition to the already provided headers of libxml2/libxslt/libexslt).

Other changes

• Wheels include libxml2 2.9.12+ and libxslt 1.1.34 (also on Windows).

v4.7.0

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• Release retracted due to missing files in lxml/includes/.

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