Backport PR #4015 on branch 1.12.x (fix: use fast-array-utils’ threadsafe njit)

[flying-sheep]

Backports #4015

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.41%. Comparing base (0a4a597) to head (786f7f1).
⚠️ 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    #4022      +/-   ##
==========================================
+ Coverage   78.36%   78.41%   +0.05%     
==========================================
  Files         117      117              
  Lines       12626    12597      -29     
==========================================
- Hits         9894     9878      -16     
+ Misses       2732     2719      -13     

Flag	Coverage Δ
hatch-test.low-vers	77.73% <100.00%> (+0.08%)	⬆️
hatch-test.pre	57.54% <100.00%> (-19.77%)	⬇️

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Files with missing lines	Coverage Δ
src/scanpy/_compat.py	84.31% <100.00%> (+12.72%)	⬆️
...c/scanpy/experimental/pp/_highly_variable_genes.py	94.23% <100.00%> (+0.05%)	⬆️
src/scanpy/metrics/_gearys_c.py	100.00% <100.00%> (ø)
src/scanpy/metrics/_morans_i.py	100.00% <100.00%> (ø)
src/scanpy/preprocessing/_normalization.py	94.73% <100.00%> (+0.07%)	⬆️
src/scanpy/preprocessing/_qc.py	94.48% <100.00%> (-1.36%)	⬇️
src/scanpy/preprocessing/_scale.py	91.30% <100.00%> (+0.09%)	⬆️
src/scanpy/preprocessing/_simple.py	90.93% <100.00%> (+0.02%)	⬆️
src/scanpy/tools/_rank_genes_groups.py	92.75% <100.00%> (+0.02%)	⬆️

... and 2 files with indirect coverage changes