Update pre-commits and pytest configuration

[lang-m]

• pre-commit: use ruff and ruff formatting to replace black, isort, flake8
• pre-commit: remove hard-coded Python version
• tests: convert all warnings to errors

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.82%. Comparing base (538b906) to head (b51faae).
Report is 3 commits behind head on master.

❗ Current head b51faae differs from pull request most recent head bd6a0e0

Please upload reports for the commit bd6a0e0 to get more accurate results.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #87   +/-   ##
=======================================
  Coverage   99.82%   99.82%           
=======================================
  Files          30       30           
  Lines         573      585   +12     
=======================================
+ Hits          572      584   +12     
  Misses          1        1           

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