[PR #8608/c4acabc backport][3.10] Fix timer handle churn in websocket heartbeat #4292

Job	Run time
Generate llhttp sources	4s
Linter	53s
Test (3.8, ubuntu, false)	5m 9s
Test (3.8, windows, false)	7m 11s
Test (3.8, Y, ubuntu, false)	5m 9s
Test (3.9, ubuntu, false)	5m 46s
Test (3.9, macos, false)	4m 0s
Test (3.9, windows, false)	5m 52s
Test (3.9, Y, ubuntu, false)	5m 19s
Test (3.10, ubuntu, false)	5m 25s
Test (3.10, macos, false)	3m 57s
Test (3.10, windows, false)	6m 47s
Test (3.10, Y, ubuntu, false)	5m 7s
Test (3.11, ubuntu, false)	5m 49s
Test (3.11, macos, false)	4m 28s
Test (3.11, windows, false)	7m 41s
Test (3.11, Y, ubuntu, false)	4m 59s
Test (3.12, ubuntu, false)	6m 9s
Test (3.12, macos, false)	4m 5s
Test (3.12, windows, false)	7m 37s
Test (3.12, Y, ubuntu, false)	5m 18s
Test (pypy-3.9, Y, ubuntu, false)	11m 12s
Test (ubuntu, 3.13, true, Y)	2m 5s
check	2s
Pre-Deploy	0s
Build wheels on ${{ matrix.os }} ${{ matrix.qemu }}	0s
Tarball	0s
Deploy	0s
	2h 0m 4s

Provide feedback