Temporary pin virtualenv < 21 #3940

Job	Run time
test_docs	25s
Test Lint	31s
check_release	47s
Make SDist	33s
Test Minimum Versions	30s
test_without_debugpy (ubuntu-latest, 3.10)	1m 15s
Test Prereleases	42s
link_check	1m 15s
build (ubuntu-latest, qt6, 3.11)	1m 15s
build (windows-latest, qt5, 3.10)	1m 13s
build (windows-latest, qt5, 3.14)	1m 13s
build (ubuntu-latest, qt6, pypy-3.11)	1m 15s
build (ubuntu-latest, qt5, pypy-3.11)	1m 15s
build (ubuntu-latest, qt6, 3.12)	1m 15s
build (ubuntu-latest, qt6, 3.10)	1m 14s
build (ubuntu-latest, qt5, 3.14)	1m 15s
build (ubuntu-latest, qt6, 3.13)	1m 15s
build (ubuntu-latest, qt5, 3.10)	1m 14s
build (macos-latest, qt5, 3.14)	1m 17s
build (windows-latest, qt6, 3.12)	1m 13s
build (windows-latest, qt6, 3.13)	1m 12s
build (macos-latest, qt6, 3.12)	1m 17s
build (macos-latest, qt5, 3.10)	1m 16s
build (windows-latest, qt5, pypy-3.11)	1m 7s
build (macos-latest, qt6, pypy-3.11)	1m 16s
build (macos-latest, qt6, 3.13)	1m 17s
build (windows-latest, qt6, 3.11)	1m 13s
build (macos-latest, qt5, pypy-3.11)	1m 17s
build (macos-latest, qt6, 3.10)	1m 16s
build (macos-latest, qt6, 3.11)	1m 17s
build (windows-latest, qt6, 3.10)	1m 13s
build (windows-latest, qt6, pypy-3.11)	1m 5s
Install from SDist and Test	38s
coverage	1s
	36m 17s

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