Update actions/checkout action to v4 #652

Job	Run time
test	1m 51s
integration-test (community-6.1.2-ga)	3m 26s
integration-test (community-6.2.0-ga)	7m 27s
integration-test (community-7.0.0)	3m 45s
integration-test (community-7.1.1)	4m 26s
integration-test (community-7.2.0)	4m 30s
integration-test (community-7.3.0)	3m 56s
integration-test (community-7.4.0)	4m 33s
integration-test (enterprise-6.1.1)	4m 30s
integration-test (enterprise-6.2.2)	4m 6s
integration-test (enterprise-7.0.1)	4m 5s
integration-test (enterprise-7.1.0)	4m 6s
integration-test (enterprise-7.2.0)	5m 22s
integration-test (enterprise-7.3.0)	4m 10s
integration-test (enterprise-7.4.0)	4m 4s
publish	0s
	1h 4m 17s

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