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Update README install command for the test dependency group #4422

Job	Run time
test_without_debugpy (ubuntu-latest, 3.11)	2m 13s
build (ubuntu-latest, qt6, 3.12)	2m 45s
build (ubuntu-latest, qt5, pypy-3.11)	4m 44s
check_release	1m 24s
build (windows-latest, qt6, 3.13)	4m 12s
test_docs	45s
build (windows-latest, qt6, pypy-3.11)	7m 17s
link_check	4m 9s
build (ubuntu-latest, qt6, 3.13)	2m 42s
build (macos-latest, qt5, 3.14)	3m 28s
build (windows-latest, qt5, 3.14)	4m 29s
Test Prereleases	2m 43s
build (ubuntu-latest, qt6, 3.11)	2m 39s
build (windows-latest, qt6, 3.11)	4m 40s
build (ubuntu-latest, qt5, 3.14)	2m 39s
build (ubuntu-latest, qt6, pypy-3.11)	5m 53s
build (macos-latest, qt6, 3.13)	2m 39s
build (macos-latest, qt6, pypy-3.11)	7m 3s
Make SDist	26s
build (macos-latest, qt5, pypy-3.11)	6m 26s
build (macos-latest, qt6, 3.12)	3m 27s
build (windows-latest, qt6, 3.12)	4m 21s
build (windows-latest, qt5, pypy-3.11)	7m 23s
Test Minimum Versions	3m 2s
Test Lint	1m 1s
build (macos-latest, qt6, 3.11)	2m 41s
Install from SDist and Test	2m 10s
coverage	12s
	1h 37m 33s