hack/tools: use mainstream conversion-gen

Author: damdo

hack/tools/Makefile

@@ -76,8 +76,8 @@ $(CONTROLLER_GEN): $(BIN_DIR) go.mod go.sum # Build controller-gen from tools fo
 	go build -tags=tools -o $@ sigs.k8s.io/controller-tools/cmd/controller-gen
 
 CONVERSION_GEN := $(BIN_DIR)/conversion-gen
-$(CONVERSION_GEN): $(BIN_DIR) go.mod go.sum $(call rwildcard,.,third_party/conversion-gen/*.*)
-	go build -tags=tools -o $@ ./third_party/conversion-gen
+$(CONVERSION_GEN): $(BIN_DIR) go.mod go.sum
+	go build -tags=tools -o $@ k8s.io/code-generator/cmd/conversion-gen
 
 CONVERSION_VERIFIER := $(BIN_DIR)/conversion-verifier
 $(CONVERSION_VERIFIER): $(BIN_DIR) go.mod go.sum