Ruff update

[m-reuter]

fix a few more code style things

[codecov]

Codecov Report

Attention: Patch coverage is 35.29412% with 11 lines in your changes missing coverage. Please review.

Project coverage is 26.00%. Comparing base (9c87d3b) to head (f46d684).
Report is 13 commits behind head on main.

Files with missing lines	Patch %	Lines
brainprint/surfaces.py	28.57%	5 Missing ⚠️
brainprint/brainprint.py	40.00%	3 Missing ⚠️
brainprint/utils/utils.py	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #30      +/-   ##
==========================================
- Coverage   26.62%   26.00%   -0.63%     
==========================================
  Files           8        8              
  Lines         353      350       -3     
  Branches       43       43              
==========================================
- Hits           94       91       -3     
  Misses        256      256              
  Partials        3        3              

Flag	Coverage Δ
unittests	26.00% <35.29%> (-0.63%)	⬇️

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