Use version of gocov supported by sonic-gnmi (#300)

Why I did it
axw gocov was modified to use go 1.22 while currently sonic-gnmi still uses 1.13 a few days ago from this PR creation date. To ensure pipeline still works, we are specifying last stable version of axw gocov that still worked with sonic-gnmi pipeline which was 1.1.0

How I did it
Specify gocov version

How to verify it
Pipeline

Makefile

@@ -134,7 +134,7 @@ endif
 	sudo CGO_LDFLAGS="$(CGO_LDFLAGS)" CGO_CXXFLAGS="$(CGO_CXXFLAGS)" $(GO) test -race -coverprofile=coverage-data.txt -covermode=atomic -mod=vendor -v github.com/sonic-net/sonic-gnmi/sonic_data_client
 	sudo CGO_LDFLAGS="$(CGO_LDFLAGS)" CGO_CXXFLAGS="$(CGO_CXXFLAGS)" $(GO) test -race -coverprofile=coverage-dbus.txt -covermode=atomic -mod=vendor -v github.com/sonic-net/sonic-gnmi/sonic_service_client
 	sudo CGO_LDFLAGS="$(CGO_LDFLAGS)" CGO_CXXFLAGS="$(CGO_CXXFLAGS)" $(TESTENV) $(GO) test -race -coverprofile=coverage-translutils.txt -covermode=atomic -mod=vendor -v github.com/sonic-net/sonic-gnmi/transl_utils
-	$(GO) install github.com/axw/gocov/gocov@latest
+	$(GO) install github.com/axw/gocov/gocov@v1.1.0
 	$(GO) install github.com/AlekSi/gocov-xml@latest
 	$(GO) mod vendor
 	gocov convert coverage-*.txt | gocov-xml -source $(shell pwd) > coverage.xml