Bump lxml from 5.1.0 to 5.2.1 in /requirements in the pypi group

[dependabot]

Bumps the pypi group in /requirements with 1 update: lxml.

Updates lxml from 5.1.0 to 5.2.1

Changelog

Sourced from lxml's changelog.

5.2.1 (2024-04-02)

Bugs fixed

• LP#2059910: The minimum CPU architecture for the Linux x86 binary wheels was set back to "core2", but with SSE 4.2 enabled.

• LP#2059977: Element.iterfind("//absolute_path") failed with a SyntaxError where it should have issued a warning.

• GH#416: The documentation build was using the non-standard which command. Patch by Michał Górny.

5.2.0 (2024-03-30)

Other changes

• LP#1958539: The lxml.html.clean implementation suffered from several (only if used) security issues in the past and was now extracted into a separate library:

  https://github.com/fedora-python/lxml_html_clean

  Projects that use lxml without "lxml.html.clean" will not notice any difference, except that they won't have potentially vulnerable code installed. The module is available as an "extra" setuptools dependency "lxml[html_clean]", so that Projects that need "lxml.html.clean" will need to switch their requirements from "lxml" to "lxml[html_clean]", or install the new library themselves.

• The minimum CPU architecture for the Linux x86 binary wheels was upgraded to "sandybridge" (launched 2011), and glibc 2.28 / gcc 12 (manylinux_2_28) wheels were added.

• Built with Cython 3.0.10.

5.1.2 (2024-??-??)

Bugs fixed

• LP#2059977: Element.iterfind("//absolute_path") failed with a SyntaxError where it should have issued a warning.

5.1.1 (2024-03-28)

... (truncated)

Commits

• 47f94ff Update changelog.
• 932a41e Update macOS build isntructions.
• 888153a Merge branch 'lxml-5.1'
• fcf00fb Update changelog.
• 76fd4f9 Fix SyntaxError in Element.iterfind() that should have been a warning.
• 4faebe3 Fix test.
• 9b8e36d Fix SyntaxError in Element.iterfind() that should have been a warning.
• 175c66a Build: Reduce the number of build jobs by disabling some old targets.
• 06ad31c Prepare release of 5.2.1.
• 24dafd3 Build: Fix Makefile to work on systems without which(1) (GH-416)
• Additional commits viewable in compare view

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[dependabot]

Looks like lxml is updatable in another way, so this is no longer needed.