GH Actions: Add pypy3.11 to testing matrix

[aaronliu0130]

idea by @cclauss. See also #10286; we maintain the same project.

Type of Changes

	Type
	uhhhh i don't think anything applies‽

[aaronliu0130]

Also, the only problem we had was with pypy-3.11 on Windows. It obtained the latest version of pytest without issue on other platforms and CPython, but on Windows, it said there was no suitable version on PyPI despite Pylint being platform-independent:

ERROR: No matching distribution found for pylint>=3.3.5; extra == "dev"

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.86%. Comparing base (62ac273) to head (e318954).

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #10287   +/-   ##
=======================================
  Coverage   95.86%   95.86%           
=======================================
  Files         175      175           
  Lines       19074    19074           
=======================================
  Hits        18286    18286           
  Misses        788      788           

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[github-actions]

🤖 According to the primer, this change has no effect on the checked open source code. 🤖🎉

This comment was generated for commit e318954