DEV: Remove ignore Ruff rule RET503

[j-t-1]

RET503: Missing explicit "return" at the end of function able to return non-"None" value.

[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 97.08%. Comparing base (5848de3) to head (c7955f0).

Files with missing lines	Patch %	Lines
pypdf/_writer.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3209      +/-   ##
==========================================
- Coverage   97.09%   97.08%   -0.01%     
==========================================
  Files          56       56              
  Lines        9657     9660       +3     
  Branches     1748     1748              
==========================================
+ Hits         9376     9378       +2     
- Misses        168      169       +1     
  Partials      113      113              

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[j-t-1]

@stefan6419846 could you fix the two Ruff errors (2 fixable with the --fix option)? I do not have Ruff installed.

[stefan6419846]

could you fix the two Ruff errors

Just use return None instead of return in these cases if it is a correct detection (as indicated in the help for the violation). If the detection is wrong, we would have to check manually anyway.