Bump actions/checkout from 4 to 7 #1478

Job	Run time
windows-latest (devel, conda)	13m 17s
macOS-latest (release, brew)	4m 14s
windows-latest (release, pip)	4m 12s
macOS-latest (release, pip)	3m 5s
ubuntu-latest (release, pip)	2m 41s
windows-latest (release, conda)	12m 39s
macOS-latest (release, conda)	9m 20s
ubuntu-latest (release, conda)	6m 26s
	55m 54s

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