Backport PR #1914 on branch 0.11.x ((fix): add convert_strings_to_categoricals to methods )

[flying-sheep]

backport #1914

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.71%. Comparing base (decd534) to head (4d6f119).
Report is 17 commits behind head on 0.11.x.

Additional details and impacted files

@@            Coverage Diff             @@
##           0.11.x    #1920      +/-   ##
==========================================
- Coverage   85.99%   83.71%   -2.28%     
==========================================
  Files          41       41              
  Lines        6277     6277              
==========================================
- Hits         5398     5255     -143     
- Misses        879     1022     +143     

Files with missing lines	Coverage Δ
src/anndata/_core/anndata.py	82.47% <100.00%> (ø)
src/anndata/_core/file_backing.py	88.69% <100.00%> (ø)
src/anndata/_io/h5ad.py	92.68% <100.00%> (ø)
src/anndata/_io/read.py	81.48% <100.00%> (ø)
src/anndata/_io/specs/methods.py	88.23% <ø> (-0.41%)	⬇️
src/anndata/_io/write.py	77.01% <100.00%> (ø)
src/anndata/_io/zarr.py	83.54% <100.00%> (ø)
src/anndata/experimental/merge.py	86.95% <100.00%> (ø)

... and 6 files with indirect coverage changes

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