fix: update niche function parameters to use 'copy' instead of 'inpla…

[selmanozleyen]

fixes: #1273

Since they are new functions that are unreleased, I didn't see the need to warn users

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.67%. Comparing base (76b6757) to head (90db427).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1274      +/-   ##
==========================================
+ Coverage   78.60%   78.67%   +0.06%     
==========================================
  Files          63       63              
  Lines        9348     9339       -9     
  Branches     1559     1555       -4     
==========================================
- Hits         7348     7347       -1     
+ Misses       1426     1422       -4     
+ Partials      574      570       -4     

Files with missing lines	Coverage Δ
src/squidpy/_docs.py	95.23% <ø> (-0.06%)	⬇️
src/squidpy/gr/_niche.py	77.72% <100.00%> (+1.57%)	⬆️

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