Backport PR #14148: fix RTD #90

Job	Run time
test (ubuntu-latest, 3.8, test_extra)	3m 0s
test (ubuntu-latest, 3.9, test_extra)	2m 35s
test (ubuntu-latest, 3.10, test_extra)	2m 56s
test (ubuntu-latest, 3.11, test_extra)	2m 45s
test (windows-latest, 3.8, test_extra)	4m 0s
test (windows-latest, 3.9, test_extra)	4m 23s
test (windows-latest, 3.10, test_extra)	4m 12s
test (windows-latest, 3.11, test_extra)	4m 37s
test (macos-latest, 3.8, test_extra)	4m 29s
test (macos-latest, 3.11, test_extra)	3m 50s
test (ubuntu-latest, 3.11, test)	2m 9s
test (ubuntu-latest, 3.12-dev, test)	3m 6s
test (ubuntu-latest, pypy-3.8, test)	3m 53s
test (windows-latest, pypy-3.8, test)	5m 21s
test (macos-latest, pypy-3.8, test)	5m 10s
	56m 26s

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