fix: loki version prefix in Makefile (#12515)

Backport dff72d2 from #12514

Co-authored-by: Trevor Whitney <trevorjwhitney@gmail.com>

Makefile

@@ -55,7 +55,7 @@ GIT_BRANCH := $(shell git rev-parse --abbrev-ref HEAD)
 DONT_FIND := -name tools -prune -o -name vendor -prune -o -name operator -prune -o -name .git -prune -o -name .cache -prune -o -name .pkg -prune -o
 
 # Build flags
-VPREFIX := github.com/grafana/loki/pkg/util/build
+VPREFIX := github.com/grafana/loki/v3/pkg/util/build
 GO_LDFLAGS   := -X $(VPREFIX).Branch=$(GIT_BRANCH) -X $(VPREFIX).Version=$(IMAGE_TAG) -X $(VPREFIX).Revision=$(GIT_REVISION) -X $(VPREFIX).BuildUser=$(shell whoami)@$(shell hostname) -X $(VPREFIX).BuildDate=$(shell date -u +"%Y-%m-%dT%H:%M:%SZ")
 GO_FLAGS     := -ldflags "-extldflags \"-static\" -s -w $(GO_LDFLAGS)" -tags netgo
 DYN_GO_FLAGS := -ldflags "-s -w $(GO_LDFLAGS)" -tags netgo