fix go version for integration tests (#5882) #8769

Job	Run time
test	21m 41s
lint	3m 46s
CodeQL	7m 46s
build	3m 48s
integration (requires_docker)	6m 37s
integration-configs-db	2m 28s
integration (integration_alertmanager)	4m 37s
integration (integration_backward_compatibility)	7m 53s
integration (integration_memberlist)	8m 22s
integration (integration_querier)	13m 13s
integration (integration_ruler)	4m 44s
integration (integration_query_fuzz)	2m 48s
deploy_website	1m 10s
deploy	2m 37s
	1h 31m 30s

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