Avoid base exception type error in cosmx reader

[easlinger]

Changed line warning about discrepancy between fovs in labels and images from "raise logger.warning..." to just logger.warning because it causes a type error to "raise" something that doesn't inherit from the base exception class. This is the only instance of using "raise logger.warning" I was able to find in the repo, so I'm assuming this might be a typo.

See issue 272

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 50.15%. Comparing base (70f5060) to head (8e679ed).
⚠️ Report is 83 commits behind head on main.

Files with missing lines	Patch %	Lines
src/spatialdata_io/readers/cosmx.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #275   +/-   ##
=======================================
  Coverage   50.15%   50.15%           
=======================================
  Files          26       26           
  Lines        2660     2660           
=======================================
  Hits         1334     1334           
  Misses       1326     1326           

Files with missing lines	Coverage Δ
src/spatialdata_io/readers/cosmx.py	18.93% <0.00%> (ø)

... and 1 file with indirect coverage changes

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