Fix for pandas 3 CoW policy

[selmanozleyen]

This will fix #1100 and fixes #1099. Errors can be reproduced when pd.options.mode.copy_on_write = True

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 66.21%. Comparing base (fb90f03) to head (a430855).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1106   +/-   ##
=======================================
  Coverage   66.21%   66.21%           
=======================================
  Files          44       44           
  Lines        7163     7163           
  Branches     1217     1217           
=======================================
  Hits         4743     4743           
  Misses       1943     1943           
  Partials      477      477           

Files with missing lines	Coverage Δ
src/squidpy/gr/_niche.py	32.28% <100.00%> (ø)
src/squidpy/tl/_sliding_window.py	75.86% <100.00%> (ø)

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[ilan-gold]

You can check the actual runtime configuration, I think, for users who haven't upgraded if keeping old behavior is in your interest: https://pandas.pydata.org/docs/user_guide/copy_on_write.html#migrating-to-copy-on-write

[selmanozleyen]

hi this is already backward compatible since I just replaced in chained assignment. With 3.0 it just causes bugs doesn't raise version related explicit errors.