Update actions/checkout action to v4 (#72) #249

Job	Run time
check-format	11s
validate (examples/complete)	26s
validate (examples/no-cert)	21s
validate (examples/no-cert-no-hosted-zone)	26s
validate (examples/no-hosted-zone)	25s
validate (examples/ordered-cache-behavior)	21s
mock-plan (examples/complete)	1m 22s
mock-plan (examples/no-cert)	1m 8s
mock-plan (examples/no-cert-no-hosted-zone)	1m 9s
mock-plan (examples/no-hosted-zone)	1m 10s
mock-plan (examples/ordered-cache-behavior)	1m 45s
Show infracost diff (examples/complete)	20s
Show infracost diff (examples/no-cert)	22s
Show infracost diff (examples/no-cert-no-hosted-zone)	26s
Show infracost diff (examples/no-hosted-zone)	20s
Show infracost diff (examples/ordered-cache-behavior)	19s
	10m 31s

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