Fix pandas3 tests

[grst]

fix integration testing

• CHANGELOG.md updated
• Tests added (For bug fixes or new features)
• Tutorial updated (if necessary)

[codecov]

Codecov Report

❌ Patch coverage is 0% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 19.33%. Comparing base (7256a8c) to head (3396a9b).
⚠️ Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
src/scirpy/io/_io.py	0.00%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #679      +/-   ##
==========================================
+ Coverage   19.32%   19.33%   +0.01%     
==========================================
  Files          51       51              
  Lines        4622     4628       +6     
==========================================
+ Hits          893      895       +2     
- Misses       3729     3733       +4     

Files with missing lines	Coverage Δ
src/scirpy/io/_io.py	11.93% <0.00%> (-0.24%)	⬇️

... and 1 file with indirect coverage changes

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