Correct use of asyncio.Lock to process a single control message at a time #3469

Job	Run time
test_without_debugpy (ubuntu-latest, 3.9)	2m 4s
test_docs	43s
check_release	1m 44s
Test Lint	1m 10s
build (ubuntu-latest, 3.9)	4m 3s
Test Minimum Versions	3m 58s
Make SDist	30s
build (ubuntu-latest, 3.10)	4m 36s
build (ubuntu-latest, 3.12)	5m 23s
build (windows-latest, 3.12)	8m 8s
build (ubuntu-latest, pypy-3.10)	3m 32s
build (windows-latest, 3.13)	6m 2s
build (ubuntu-latest, 3.11)	4m 29s
build (ubuntu-latest, 3.13)	4m 42s
build (windows-latest, 3.11)	5m 55s
build (windows-latest, 3.10)	6m 7s
link_check	3m 46s
build (macos-latest, 3.10)	5m 18s
build (macos-latest, 3.12)	5m 14s
build (windows-latest, 3.9)	5m 27s
build (macos-latest, pypy-3.10)	3m 52s
build (macos-latest, 3.9)	4m 12s
Test Prereleases	2m 9s
build (windows-latest, pypy-3.10)	6m 43s
build (macos-latest, 3.13)	4m 12s
build (macos-latest, 3.11)	5m 36s
Install from SDist and Test	2m 3s
coverage	-1s
	1h 51m 37s

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