Bumped all download/upload-artifact actions to be > v3. #2

Job	Run time
lint	4m 8s
test	15m 6s
CodeQL	6m 38s
build	4m 11s
integration-configs-db	2m 38s
integration (requires_docker)	6m 31s
integration (integration_alertmanager)	4m 8s
integration (integration_backward_compatibility)	9m 49s
integration (integration_memberlist)	7m 41s
integration (integration_querier)	12m 20s
integration (integration_ruler)	5m 30s
integration (integration_query_fuzz)	2m 40s
deploy_website	0s
deploy	0s
	1h 21m 20s

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