Temporary pin virtualenv < 21 #3941

Job	Run time
test_without_debugpy (ubuntu-latest, 3.10)	2m 18s
link_check	3m 32s
test_docs	17s
Test Lint	17s
Test Prereleases	29s
check_release	47s
Test Minimum Versions	32s
Make SDist	28s
build (ubuntu-latest, qt6, 3.12)	2m 35s
build (ubuntu-latest, qt5, 3.10)	2m 32s
build (windows-latest, qt5, 3.14)	3m 51s
build (ubuntu-latest, qt5, 3.14)	2m 31s
build (ubuntu-latest, qt5, pypy-3.11)	3m 42s
build (windows-latest, qt6, 3.12)	4m 2s
build (ubuntu-latest, qt6, pypy-3.11)	3m 26s
build (macos-latest, qt5, 3.14)	2m 22s
build (windows-latest, qt6, pypy-3.11)	6m 52s
build (ubuntu-latest, qt6, 3.10)	2m 49s
build (macos-latest, qt5, pypy-3.11)	1m 1s
build (windows-latest, qt5, pypy-3.11)	4m 54s
build (macos-latest, qt6, 3.12)	3m 5s
build (windows-latest, qt5, 3.10)	3m 55s
build (macos-latest, qt5, 3.10)	3m 15s
build (windows-latest, qt6, 3.11)	4m 51s
build (macos-latest, qt6, 3.11)	2m 49s
build (ubuntu-latest, qt6, 3.11)	2m 29s
build (macos-latest, qt6, 3.13)	2m 55s
build (windows-latest, qt6, 3.10)	4m 30s
build (ubuntu-latest, qt6, 3.13)	2m 51s
build (windows-latest, qt6, 3.13)	4m 21s
build (macos-latest, qt6, pypy-3.11)	4m 9s
build (macos-latest, qt6, 3.10)	3m 11s
Install from SDist and Test	2m 25s
coverage	0s
	1h 34m 3s

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