Bump actions/checkout from 3 to 4 #115

Job	Run time
Check distgen generated files	21s
Container tests: 6 - fedora	7s
Container tests: 6 - rhel7	25m 8s
Container tests: 6 - rhel8	23m 36s
Container tests: 6 - rhel9	21m 34s
Container tests: 6 - c9s	15m 30s
Container tests: 6 - c8s	17m 24s
Container tests: 7 - fedora	16m 53s
Container tests: 7 - rhel7	8s
Container tests: 7 - rhel8	5s
Container tests: 7 - rhel9	7s
Container tests: 7 - c9s	8s
Container tests: 7 - c8s	8s
	2h 1m 9s

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