Backport PR #4045 on branch 1.12.x (fix: use weights to calculate modularity)

[flying-sheep]

Backport PR #4045

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.43%. Comparing base (d348605) to head (680cb30).
⚠️ Report is 1 commits behind head on 1.12.x.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##           1.12.x    #4048      +/-   ##
==========================================
+ Coverage   77.90%   78.43%   +0.53%     
==========================================
  Files         117      117              
  Lines       12597    12597              
==========================================
+ Hits         9814     9881      +67     
+ Misses       2783     2716      -67     

Flag	Coverage Δ
hatch-test.low-vers	77.73% <100.00%> (ø)
hatch-test.pre	78.32% <100.00%> (+13.07%)	⬆️

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Files with missing lines	Coverage Δ
src/scanpy/metrics/_metrics.py	97.18% <100.00%> (ø)

... and 5 files with indirect coverage changes