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Upgrade: Bump actions/checkout from 3 to 4 #331

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Run time

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Job	Run time
test (ubuntu-latest, lts/*)	11m 56s
test (ubuntu-latest, 18)	12m 0s
test (windows-latest, lts/*)	14m 56s
test (windows-latest, 18)	14m 17s
test (macos-latest, lts/*)	13m 9s
test (macos-latest, 18)	13m 26s
automerge	11s
	1h 19m 55s