Avoid endless loop in get_git_root

[imagejan]

Also, Path(__file__) leads to incorrect behavior when the environment (and therefore the imported faim_ipa package) is outside the project repository.

This can happen when using pixi config with detached-environments=true.

So, let's use the current working directory instead.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.75%. Comparing base (02a43e9) to head (3edb054).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #196      +/-   ##
==========================================
- Coverage   92.80%   92.75%   -0.05%     
==========================================
  Files          64       64              
  Lines        3918     3920       +2     
  Branches      245      246       +1     
==========================================
  Hits         3636     3636              
- Misses        268      269       +1     
- Partials       14       15       +1     

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