Backport PR #3974 on branch 1.12.x (chore: add in accessors to silence deprecation warnings)

[meeseeksmachine]

Backport PR #3974: chore: add in accessors to silence deprecation warnings

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.28%. Comparing base (d9a8b6a) to head (dd82dff).
⚠️ Report is 31 commits behind head on 1.12.x.

Additional details and impacted files

@@            Coverage Diff             @@
##           1.12.x    #3976      +/-   ##
==========================================
+ Coverage   78.26%   78.28%   +0.01%     
==========================================
  Files         117      117              
  Lines       12634    12634              
==========================================
+ Hits         9888     9890       +2     
+ Misses       2746     2744       -2     

Flag	Coverage Δ
hatch-test.low-vers	77.56% <66.66%> (-0.04%)	⬇️
hatch-test.pre	77.22% <88.88%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
src/scanpy/plotting/_anndata.py	85.63% <100.00%> (+0.05%)	⬆️
src/scanpy/plotting/_tools/scatterplots.py	83.52% <100.00%> (ø)
src/scanpy/plotting/_utils.py	78.90% <100.00%> (+0.47%)	⬆️