Update actions/checkout version to v4 #150

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Run time

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Job	Run time
ci (2.7, 6.1)	1m 21s
ci (3.0, 6.1)	1m 7s
ci (2.5, 5.2)	1m 29s
ci (2.6, 6.0)	1m 44s
ci (2.7, 6.0)	1m 22s
	7m 3s