Fix loop variable being redefined in cache_configure

[bdraco]

The loop variable size should not get redefined. Python for doesn't define its own scope. Add more coverage to make sure everything works as expected with the backwards compat.

[codspeed-hq]

CodSpeed Performance Report

Merging #1363 will not alter performance

_{Comparing cache_configure_back_compat_cleanup (e9fb88f) with master (f42f34e)}

Summary

✅ 83 untouched benchmarks

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.97%. Comparing base (12413d3) to head (e9fb88f).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1363      +/-   ##
==========================================
+ Coverage   95.95%   95.97%   +0.01%     
==========================================
  Files          30       31       +1     
  Lines        5610     5635      +25     
  Branches      346      348       +2     
==========================================
+ Hits         5383     5408      +25     
  Misses        201      201              
  Partials       26       26              

Flag	Coverage Δ
CI-GHA	95.97% <100.00%> (+0.01%)	⬆️
MyPy	45.55% <100.00%> (+0.25%)	⬆️
OS-Linux	99.48% <100.00%> (+0.02%)	⬆️
OS-Windows	99.54% <100.00%> (+<0.01%)	⬆️
OS-macOS	99.22% <100.00%> (+<0.01%)	⬆️
Py-3.10.11	99.19% <100.00%> (+<0.01%)	⬆️
Py-3.10.15	99.43% <100.00%> (+<0.01%)	⬆️
Py-3.11.10	99.43% <100.00%> (+<0.01%)	⬆️
Py-3.11.9	99.19% <100.00%> (+<0.01%)	⬆️
Py-3.12.7	99.43% <100.00%> (+<0.01%)	⬆️
Py-3.13.0	99.43% <100.00%> (+<0.01%)	⬆️
Py-3.9.13	99.15% <100.00%> (+<0.01%)	⬆️
Py-3.9.20	99.39% <100.00%> (+<0.01%)	⬆️
Py-pypy7.3.16	99.44% <100.00%> (?)
Py-pypy7.3.17	99.47% <100.00%> (?)
VM-macos-latest	99.22% <100.00%> (+<0.01%)	⬆️
VM-ubuntu-latest	99.48% <100.00%> (+0.02%)	⬆️
VM-windows-latest	99.54% <100.00%> (+<0.01%)	⬆️
pytest	99.48% <100.00%> (+0.02%)	⬆️

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

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.