Upgrade to go 1.21.9 #8761

Job	Run time
build	4m 43s
CodeQL	7m 36s
lint	3m 50s
test	22m 21s
integration-configs-db	2m 3s
integration (requires_docker)	5m 52s
integration (integration_alertmanager)	4m 11s
integration (integration_backward_compatibility)	7m 38s
integration (integration_memberlist)	7m 17s
integration (integration_querier)	12m 33s
integration (integration_ruler)	4m 17s
integration (integration_query_fuzz)	2m 28s
deploy	0s
deploy_website	0s
	1h 24m 49s

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