Fix continuous integration

[bittremieux]

• Update GitHub Actions.
• Also remove some older Python versions during testing. Minimum supported version: 3.10.
• Replace black by Ruff for linting.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.53%. Comparing base (40151e2) to head (03efb99).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #68   +/-   ##
=======================================
  Coverage   66.53%   66.53%           
=======================================
  Files           7        7           
  Lines        1052     1052           
=======================================
  Hits          700      700           
  Misses        352      352           

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