Update filter.py

[ASEM000]

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[codecov]

Codecov Report

Attention: 8 lines in your changes are missing coverage. Please review.

Comparison is base (0176520) 97.02% compared to head (62f1dbb) 96.87%.
Report is 1 commits behind head on main.

Files	Patch %	Lines
serket/_src/image/filter.py	91.20%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #94      +/-   ##
==========================================
- Coverage   97.02%   96.87%   -0.16%     
==========================================
  Files          37       37              
  Lines        4473     4538      +65     
==========================================
+ Hits         4340     4396      +56     
- Misses        133      142       +9     

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