update upgrade-direct-deps step

Makefile

@@ -42,7 +42,7 @@ cross-compile:
 	GOOS=windows GOARCH=amd64 go build -o bin/main-windows-amd64 cmd/varnish-cache-invalidator/main.go
 
 upgrade-direct-deps:
-	for item in `grep -v 'indirect' go.mod | grep '/' | cut -d ' ' -f 1`; do \
+	for item in `egrep -v "indirect|k8s.io" go.mod | grep '/' | cut -d ' ' -f 1`; do \
 		echo "trying to upgrade direct dependency $$item" ; \
 		go get -u $$item ; \
   	done