upgrade Thanos version to commit fc1a6edf7acc82ec21ebc9fd641ce7afc4fe… #180

Job	Run time
test	17m 58s
build	4m 3s
lint	18m 50s
integration-configs-db	2m 0s
integration (requires_docker)	4m 58s
integration (integration_alertmanager)	4m 4s
integration (integration_backward_compatibility)	7m 47s
integration (integration_memberlist)	7m 52s
integration (integration_querier)	12m 41s
integration (integration_ruler)	3m 47s
integration (integration_query_fuzz)	1m 49s
deploy_website	0s
deploy	0s
	1h 25m 49s

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