build(deps): bump lxml from 5.2.0 to 5.2.1 in /requirements

[dependabot[bot]]

Bumps lxml from 5.2.0 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.

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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[saltydk]

@dependabot merge