replace pkg_resources with importlib.metadata

[brondsem]

Fixes

DeprecationWarning: pkg_resources is deprecated as an API. See https://setuptools.pypa.io/en/latest/pkg_resources.html

And some other updates (see commits)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.10%. Comparing base (c87e147) to head (167b0d9).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #77      +/-   ##
==========================================
- Coverage   94.13%   94.10%   -0.04%     
==========================================
  Files          24       24              
  Lines        2696     2697       +1     
==========================================
  Hits         2538     2538              
- Misses        158      159       +1     

Flag	Coverage Δ
tests-3.10	94.10% <100.00%> (-0.04%)	⬇️
tests-3.11	94.10% <100.00%> (-0.04%)	⬇️
tests-3.12	94.10% <100.00%> (-0.04%)	⬇️
tests-3.8	94.10% <100.00%> (-0.04%)	⬇️
tests-3.9	94.10% <100.00%> (-0.04%)	⬇️

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