Update GitHub Actions to Node.js 24 compatible versions

[rbeucher]

Automated update of GitHub Actions to versions that run on the Node.js 24 runtime, replacing deprecated Node.js 16/20 versions.

All workflow YAML changes are limited to official GitHub Actions major version bumps (e.g. actions/checkout, actions/setup-python, etc.).

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.88%. Comparing base (0f6391f) to head (d376cc8).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #95   +/-   ##
=======================================
  Coverage   96.88%   96.88%           
=======================================
  Files           7        7           
  Lines         545      545           
=======================================
  Hits          528      528           
  Misses         17       17           

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