[PR #10891/802152a backport][3.12] Fix flakey signal handling tests

[bdraco]

(cherry picked from commit 802152a)

[codspeed-hq]

CodSpeed Performance Report

Merging #10896 will not alter performance

_{Comparing patchback/backports/3.12/802152af61bb29157724947dd0bd884e5394db71/pr-10891 (e6925b8) with 3.12 (ad7ee7c)}

Summary

✅ 60 untouched benchmarks

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.15%. Comparing base (ad7ee7c) to head (e6925b8).
Report is 1 commits behind head on 3.12.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             3.12   #10896      +/-   ##
==========================================
+ Coverage   98.13%   98.15%   +0.01%     
==========================================
  Files         130      130              
  Lines       39129    39137       +8     
  Branches     2218     2218              
==========================================
+ Hits        38401    38416      +15     
+ Misses        555      551       -4     
+ Partials      173      170       -3     

Flag	Coverage Δ
CI-GHA	98.04% <100.00%> (+0.01%)	⬆️
OS-Linux	97.77% <100.00%> (+0.01%)	⬆️
OS-Windows	95.23% <0.00%> (+0.49%)	⬆️
OS-macOS	96.95% <100.00%> (+0.06%)	⬆️
Py-3.10.11	96.82% <100.00%> (+0.26%)	⬆️
Py-3.10.17	97.37% <100.00%> (+0.63%)	⬆️
Py-3.11.12	97.43% <100.00%> (+0.59%)	⬆️
Py-3.11.9	96.92% <100.00%> (+0.26%)	⬆️
Py-3.12.10	97.84% <100.00%> (+1.08%)	⬆️
Py-3.13.3	97.82% <100.00%> (+0.24%)	⬆️
Py-3.9.13	96.71% <100.00%> (+1.96%)	⬆️
Py-3.9.22	97.22% <100.00%> (+0.17%)	⬆️
Py-pypy7.3.16	86.54% <0.00%> (?)
VM-macos	96.95% <100.00%> (+0.06%)	⬆️
VM-ubuntu	97.77% <100.00%> (+0.01%)	⬆️
VM-windows	95.23% <0.00%> (+0.49%)	⬆️

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