Fix labelset race condition (#6573) #11205

Job	Run time
CodeQL	6m 48s
CodeQL	6m 48s
build	4m 17s
build	4m 17s
lint	4m 30s
lint	4m 30s
test	16m 6s
test	16m 4s
test-no-race	7m 41s
test-no-race	7m 42s
integration-configs-db	2m 49s
integration-configs-db	2m 49s
integration (requires_docker)	7m 16s
integration (requires_docker)	7m 16s
integration (integration_alertmanager)	4m 10s
integration (integration_alertmanager)	4m 10s
integration (integration_backward_compatibility)	10m 29s
integration (integration_backward_compatibility)	10m 29s
integration (integration_memberlist)	7m 45s
integration (integration_memberlist)	7m 45s
integration (integration_querier)	15m 2s
integration (integration_querier)	15m 2s
integration (integration_ruler)	5m 48s
integration (integration_ruler)	5m 48s
integration (integration_query_fuzz)	4m 58s
integration (integration_query_fuzz)	4m 58s
deploy_website	0s
deploy_website	52s
deploy	0s
deploy	3m 21s
	3h 19m 30s

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