R-CMD-check

chore: update workflows to use actions/checkout@v4 and fix README ref… #316

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Job	Run time
ubuntu-latest (release)	3m 14s
ubuntu-latest (devel)	3m 34s
macos-latest (release)	3m 18s
windows-latest (release)	4m 21s
windows-latest (oldrel-4)	7m 47s
ubuntu-latest (oldrel-1)	3m 21s
	25m 35s