makefile: use direct proxy before goproxy

IBM has published multiple 1.6.0 releases, and the goproxy server is still
holding outdated 1.6.0 release information. To address this issue, we will
begin using the direct proxy instead of the goproxy server.

Signed-off-by: Nitin Goyal <nigoyal@redhat.com>

hack/make-project-vars.mk

@@ -5,7 +5,7 @@ ENVTEST_ASSETS_DIR := $(PROJECT_DIR)/testbin
 GOBIN ?= $(BIN_DIR)
 GOOS ?= $(shell go env GOOS)
 GOARCH ?= $(shell go env GOARCH)
-GOPROXY ?= https://proxy.golang.org/
+GOPROXY ?= direct,https://proxy.golang.org
 
 GO_LINT_IMG_LOCATION ?= golangci/golangci-lint
 GO_LINT_IMG_TAG ?= v1.49.0