sync setup.cfg with .pre-commit-config.yaml

[raybellwaves]

Keep setup.cfg inline with .pre-commit-config.yaml

We leave most of the CI to pre-commit / GHA but this helps match the settings if a developer want to run one tool locally e.g. mypy

[codecov]

Codecov Report

Merging #323 (b06eaab) into main (1f9270c) will decrease coverage by 0.06%.
The diff coverage is 92.85%.

@@            Coverage Diff             @@
##             main     #323      +/-   ##
==========================================
- Coverage   94.58%   94.51%   -0.07%     
==========================================
  Files          23       23              
  Lines        2604     2626      +22     
==========================================
+ Hits         2463     2482      +19     
- Misses        141      144       +3     

Impacted Files	Coverage Δ
xskillscore/core/comparative.py	91.20% <88.57%> (-2.22%)	⬇️
xskillscore/__init__.py	84.61% <100.00%> (ø)
xskillscore/tests/test_comparative.py	100.00% <100.00%> (ø)

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[raybellwaves]

@aaronspring hope you don't mind me merging here. I think for small change this we need not bother the other person for approval.