DM-35191: Add test matrix for python versions

[mwittgen]

No description provided.

[codecov]

Codecov Report

Merging #75 (f77f060) into main (a31d6b5) will increase coverage by 0.20%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main      #75      +/-   ##
==========================================
+ Coverage   83.68%   83.88%   +0.20%     
==========================================
  Files          40       40              
  Lines        2972     3009      +37     
==========================================
+ Hits         2487     2524      +37     
  Misses        485      485              

Impacted Files	Coverage Δ
python/lsst/pex/config/dictField.py	82.35% <0.00%> (+0.13%)	⬆️
python/lsst/pex/config/callStack.py	93.61% <0.00%> (+0.13%)	⬆️
python/lsst/pex/config/configChoiceField.py	85.14% <0.00%> (+0.16%)	⬆️
python/lsst/pex/config/registry.py	83.83% <0.00%> (+0.16%)	⬆️
python/lsst/pex/config/config.py	90.28% <0.00%> (+0.30%)	⬆️
tests/test_history.py	94.44% <0.00%> (+0.32%)	⬆️
python/lsst/pex/config/configurableField.py	79.39% <0.00%> (+0.38%)	⬆️
python/lsst/pex/config/listField.py	81.92% <0.00%> (+0.63%)	⬆️
python/lsst/pex/config/wrap.py	11.30% <0.00%> (+0.77%)	⬆️
python/lsst/pex/config/history.py	64.13% <0.00%> (+1.20%)	⬆️
... and 1 more

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