Backports and extra changes to fix CI on 6.x branch #3242

Job	Run time
build (ubuntu-latest, 3.9)	3m 12s
link_check	1m 49s
check_release	1m 51s
build (ubuntu-latest, 3.12)	3m 25s
Make SDist	27s
build (windows-latest, 3.9)	9m 3s
test_docs	2m 52s
build (windows-latest, 3.12)	8m 22s
build (macos-latest, 3.9)	4m 40s
Test Lint	50s
build (macos-latest, 3.12)	4m 44s
Test Minimum Versions	2m 4s
build (ubuntu-latest, pypy-3.9)	4m 17s
build (macos-latest, 3.10)	4m 39s
Test Prereleases	1m 53s
test_without_debugpy (ubuntu-latest, 3.9)	1m 47s
build (ubuntu-latest, 3.11)	2m 58s
Install from SDist and Test	1m 42s
coverage	7s
tests_check	2s
	1h 0m 44s

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