Forward port from 6.x: Correct use of asyncio.Lock to process a singl… #3475

Job	Run time
Test Lint	1m 18s
test_docs	1m 8s
check_release	1m 42s
test_without_debugpy (ubuntu-latest, 3.9)	2m 28s
Test Minimum Versions	2m 43s
Make SDist	26s
Test Prereleases	2m 28s
link_check	3m 35s
build (ubuntu-latest, 3.9)	5m 3s
build (ubuntu-latest, 3.10)	5m 10s
build (ubuntu-latest, 3.13)	5m 13s
build (ubuntu-latest, 3.12)	5m 57s
build (ubuntu-latest, pypy-3.10)	4m 13s
build (ubuntu-latest, 3.11)	5m 5s
build (windows-latest, 3.12)	7m 31s
build (windows-latest, 3.10)	6m 56s
build (windows-latest, pypy-3.10)	7m 34s
build (macos-latest, 3.10)	4m 56s
build (macos-latest, 3.11)	4m 51s
build (windows-latest, 3.13)	6m 35s
build (macos-latest, 3.12)	6m 9s
build (windows-latest, 3.11)	7m 5s
build (macos-latest, 3.9)	5m 5s
build (windows-latest, 3.9)	6m 38s
build (macos-latest, 3.13)	5m 14s
build (macos-latest, pypy-3.10)	4m 54s
Install from SDist and Test	2m 20s
coverage	18s
	2h 2m 35s

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