[PR #8546/a561fa99 backport][3.10] Fix WebSocket server heartbeat timeout logic

[bdraco]

Co-authored-by: J. Nick Koston nick@koston.org
(cherry picked from commit 4140b0e)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.60%. Comparing base (bf5a66f) to head (821f794).
Report is 200 commits behind head on 3.10.

Additional details and impacted files

@@            Coverage Diff             @@
##             3.10    #8573      +/-   ##
==========================================
+ Coverage   97.57%   97.60%   +0.02%     
==========================================
  Files         108      108              
  Lines       33634    33656      +22     
  Branches     4034     4037       +3     
==========================================
+ Hits        32819    32849      +30     
+ Misses        594      589       -5     
+ Partials      221      218       -3     

Flag	Coverage Δ
CI-GHA	97.50% <100.00%> (+0.02%)	⬆️
OS-Linux	97.17% <100.00%> (+0.01%)	⬆️
OS-Windows	94.70% <100.00%> (+<0.01%)	⬆️
OS-macOS	96.85% <100.00%> (+0.02%)	⬆️
Py-3.10.11	96.93% <100.00%> (+0.01%)	⬆️
Py-3.10.14	96.89% <100.00%> (+0.01%)	⬆️
Py-3.11.9	97.13% <100.00%> (+0.01%)	⬆️
Py-3.12.4	97.24% <100.00%> (+0.01%)	⬆️
Py-3.8.10	94.43% <100.00%> (+<0.01%)	⬆️
Py-3.8.18	96.79% <100.00%> (+0.01%)	⬆️
Py-3.9.13	96.94% <100.00%> (+0.02%)	⬆️
Py-3.9.19	96.90% <100.00%> (+0.01%)	⬆️
Py-pypy7.3.16	96.47% <100.00%> (+0.02%)	⬆️
VM-macos	96.85% <100.00%> (+0.02%)	⬆️
VM-ubuntu	97.17% <100.00%> (+0.01%)	⬆️
VM-windows	94.70% <100.00%> (+<0.01%)	⬆️

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