MM-59940: Pin govet version to a SHA version (#27885)

https://mattermost.atlassian.net/browse/MM-59940
```release-note
NONE
```

server/Makefile

@@ -748,7 +748,9 @@ ifeq ($(BUILD_ENTERPRISE_READY),true)
 endif
 
 vet: ## Run mattermost go vet specific checks
-	$(GO) install github.com/mattermost/mattermost-govet/v2@new
+	## Note that it is pinned to a specific commit, rather than a branch. This is to prevent
+	## having to backport the fix to multiple release branches for any new change.
+	$(GO) install github.com/mattermost/mattermost-govet/v2@72e7752bcf59b57688fcb41173a6a1583c405adf
 	$(GO) vet -vettool=$(GOBIN)/mattermost-govet -structuredLogging -inconsistentReceiverName -emptyStrCmp -tFatal -configtelemetry -errorAssertions -license -inconsistentReceiverName.ignore=session_serial_gen.go,team_member_serial_gen.go,user_serial_gen.go ./...
  ifeq ($(BUILD_ENTERPRISE_READY),true)
   ifneq ($(MM_NO_ENTERPRISE_LINT),true)
@@ -760,7 +762,7 @@ vet-api: export GO := $(GO)
 vet-api: export GOBIN := $(GOBIN)
 vet-api: export ROOT := $(ROOT)
 vet-api: ## Run mattermost go vet to verify api4 documentation, currently not passing
-	$(GO) install github.com/mattermost/mattermost-govet/v2@new
+	$(GO) install github.com/mattermost/mattermost-govet/v2@72e7752bcf59b57688fcb41173a6a1583c405adf
 	make -C ../api build
 	./scripts/vet-api-check.sh