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Update install instructions with `--locked` #825

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Run time

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Job	Run time
Vet Dependencies	1m 37s
Lint	2m 23s
Test (ubuntu-20.04-16core)	3m 42s
Test (windows-2022-16core)	3m 26s
Test (macOS-latest-xl)	4m 59s
	16m 7s