fix: ruff errors

[jonasteuwen]

This updates ruff 0.15.1 to 0.16.2 and addresses all its warnings/errors

[codecov]

Codecov Report

❌ Patch coverage is 86.23188% with 57 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.71%. Comparing base (f734e7a) to head (51ea8d2).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
direct/engine.py	57.57%	14 Missing ⚠️
direct/utils/io.py	47.05%	9 Missing ⚠️
direct/inference.py	0.00%	6 Missing ⚠️
direct/environment.py	44.44%	5 Missing ⚠️
direct/nn/mobilenet/mobilenet.py	0.00%	3 Missing ⚠️
direct/train.py	50.00%	3 Missing ⚠️
direct/checkpointer.py	80.00%	2 Missing ⚠️
direct/launch.py	60.00%	2 Missing ⚠️
direct/nn/vsharp/vsharp.py	71.42%	2 Missing ⚠️
direct/utils/writers.py	0.00%	2 Missing ⚠️
... and 9 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #315      +/-   ##
==========================================
- Coverage   84.74%   84.71%   -0.03%     
==========================================
  Files         110      110              
  Lines       10152    10122      -30     
==========================================
- Hits         8603     8575      -28     
+ Misses       1549     1547       -2     

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[georgeyiasemis]

LGTM