Test against and fix for pdm>=2.19

[noirbizarre]

Hello 👋🏼

This PR:

• adds pdm~=2.19 to the tox test suite
• adds some basic integration tests for pdm which allowed to reproduce the 2.19 breakage and should now fail in the scheduled nightly when some breaking changes are incoming
• fixes support for pdm>=2.19 by simply removing the unused keyword arguments from the post_install handler (which also makes it more resilient to future changes)

Note

Attestation has been disabled on pull requests and forks as this is not supported and recommanded not to.
See:

• Attest build provenance of artifacts hynek/build-and-inspect-python-package#122 (comment)
• Sigstore signing? hynek/build-and-inspect-python-package#105 (comment)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.32%. Comparing base (6073623) to head (2d21138).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #43      +/-   ##
==========================================
+ Coverage   95.80%   96.32%   +0.52%     
==========================================
  Files           9        9              
  Lines         572      572              
  Branches      105      105              
==========================================
+ Hits          548      551       +3     
+ Misses         21       18       -3     
  Partials        3        3              

Flag	Coverage Δ
unittests	96.15% <100.00%> (+0.52%)	⬆️

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[GabDug]

As always, thanks a lot!