Replace `cespare/xxhash` with `cespare/xxhash/v2` (#6467) #10856

Job	Run time
lint	4m 24s
build	4m 13s
CodeQL	7m 22s
test	15m 53s
test-no-race	7m 27s
integration-configs-db	2m 43s
integration (requires_docker)	7m 16s
integration (integration_alertmanager)	4m 8s
integration (integration_backward_compatibility)	10m 16s
integration (integration_memberlist)	7m 50s
integration (integration_querier)	15m 25s
integration (integration_ruler)	5m 35s
integration (integration_query_fuzz)	4m 32s
deploy_website	49s
deploy	2m 43s
	1h 40m 36s

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