[PR #10675/048ef4c backport][3.12] Remove useless nonlocal statements in tests

[bdraco]

discovered by new flake8 in
#10653

(cherry picked from commit 048ef4c)

[codspeed-hq]

CodSpeed Performance Report

Merging #10678 will not alter performance

_{Comparing patchback/backports/3.12/048ef4c617130ef5a29a70ad67e34d9395891ac1/pr-10675 (5099a69) with 3.12 (d3c4543)}

Summary

✅ 51 untouched benchmarks

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.10%. Comparing base (d3c4543) to head (5099a69).
Report is 198 commits behind head on 3.12.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             3.12   #10678      +/-   ##
==========================================
+ Coverage   98.08%   98.10%   +0.01%     
==========================================
  Files         126      126              
  Lines       37607    37607              
  Branches     2131     2131              
==========================================
+ Hits        36886    36893       +7     
+ Misses        549      545       -4     
+ Partials      172      169       -3     

Flag	Coverage Δ
CI-GHA	97.98% <ø> (+0.01%)	⬆️
OS-Linux	97.68% <ø> (+0.01%)	⬆️
OS-Windows	94.76% <ø> (+0.01%)	⬆️
OS-macOS	96.82% <ø> (+<0.01%)	⬆️
Py-3.10.11	96.71% <ø> (+0.29%)	⬆️
Py-3.10.16	97.26% <ø> (-0.01%)	⬇️
Py-3.11.11	97.33% <ø> (-0.05%)	⬇️
Py-3.11.9	96.80% <ø> (-0.02%)	⬇️
Py-3.12.9	97.77% <ø> (+0.87%)	⬆️
Py-3.13.2	97.76% <ø> (+0.26%)	⬆️
Py-3.9.13	96.59% <ø> (+<0.01%)	⬆️
Py-3.9.21	97.13% <ø> (+0.03%)	⬆️
Py-pypy7.3.16	93.93% <ø> (?)
VM-macos	96.82% <ø> (+<0.01%)	⬆️
VM-ubuntu	97.68% <ø> (+0.01%)	⬆️
VM-windows	94.76% <ø> (+0.01%)	⬆️

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