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Update install.md: simplify #1161

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Job	Run time
build (ubuntu-latest, 3.10)	57s
build (ubuntu-latest, 3.11)	41s
build (macos-latest, 3.10)	54s
build (macos-latest, 3.8)	1m 41s
build (windows-latest, 3.11)	2m 24s
build (macos-latest, 3.11)	45s
build (windows-latest, 3.8)	2m 5s
build (ubuntu-latest, 3.8)	41s
build (windows-latest, 3.10)	1m 42s
	11m 50s