prepare 1.16.0-rc release (#5639) #7993

Job	Run time
test	28m 30s
test	28m 30s
build	4m 3s
build	4m 3s
lint	16m 30s
lint	16m 30s
integration (requires_docker)	7m 37s
integration (requires_docker)	7m 37s
integration-configs-db	1m 59s
integration-configs-db	1m 59s
integration (integration_alertmanager)	5m 29s
integration (integration_alertmanager)	5m 29s
integration (integration_backward_compatibility)	11m 26s
integration (integration_backward_compatibility)	9m 24s
integration (integration_memberlist)	7m 26s
integration (integration_memberlist)	7m 26s
integration (integration_querier)	16m 34s
integration (integration_querier)	16m 34s
integration (integration_ruler)	5m 6s
integration (integration_ruler)	5m 6s
integration (integration_query_fuzz)	3m 4s
integration (integration_query_fuzz)	3m 4s
deploy_website	1m 14s
deploy_website	1m 14s
deploy	0s
deploy	3m 4s
	3h 38m 58s

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