[PR #9883/a118114 backport][3.11] Fix improperly closed WebSocket connections generating a backtrace

[bdraco]

(cherry picked from commit a118114)

[codspeed-hq]

CodSpeed Performance Report

Merging #9884 will not alter performance

_{Comparing patchback/backports/3.11/a11811471ded1a4df59302316d12fc90a3cfc819/pr-9883 (0e187c8) with 3.11 (e998143)}

Summary

✅ 24 untouched benchmarks

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.99%. Comparing base (e998143) to head (0e187c8).
Report is 1 commits behind head on 3.11.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             3.11    #9884      +/-   ##
==========================================
+ Coverage   97.82%   97.99%   +0.17%     
==========================================
  Files         119      119              
  Lines       36392    36435      +43     
  Branches     4353     4364      +11     
==========================================
+ Hits        35599    35706     +107     
+ Misses        588      545      -43     
+ Partials      205      184      -21     

Flag	Coverage Δ
CI-GHA	97.88% <100.00%> (+0.15%)	⬆️
OS-Linux	97.58% <100.00%> (+0.19%)	⬆️
OS-Windows	94.44% <97.43%> (+0.43%)	⬆️
OS-macOS	96.69% <97.43%> (+0.08%)	⬆️
Py-3.10.11	96.54% <97.43%> (-0.01%)	⬇️
Py-3.10.15	97.14% <100.00%> (+0.04%)	⬆️
Py-3.11.10	97.16% <100.00%> (+<0.01%)	⬆️
Py-3.11.9	96.61% <97.43%> (+0.28%)	⬆️
Py-3.12.7	97.65% <100.00%> (+1.18%)	⬆️
Py-3.13.0	97.65% <100.00%> (+1.17%)	⬆️
Py-3.9.13	96.47% <97.43%> (?)
Py-3.9.20	97.06% <100.00%> (?)
Py-pypy7.3.16	96.61% <100.00%> (?)
VM-macos	96.69% <97.43%> (+0.08%)	⬆️
VM-ubuntu	97.58% <100.00%> (+0.19%)	⬆️
VM-windows	94.44% <97.43%> (+0.43%)	⬆️

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