Apply extra Ruff rule

[gerlero]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 91.66667% with 6 lines in your changes missing coverage. Please review.

Project coverage is 87.42%. Comparing base (c7cd976) to head (0644a7d).
Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
foamlib/_cases/_sync.py	80.00%	2 Missing ⚠️
foamlib/_cases/_async.py	83.33%	1 Missing ⚠️
foamlib/_cases/_run.py	92.85%	1 Missing ⚠️
foamlib/_cases/_util.py	75.00%	1 Missing ⚠️
foamlib/_files/_io.py	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #248      +/-   ##
==========================================
- Coverage   87.74%   87.42%   -0.33%     
==========================================
  Files          16       16              
  Lines        1273     1288      +15     
==========================================
+ Hits         1117     1126       +9     
- Misses        156      162       +6     

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