Drop obsolete vgopath usage

Author: MartinWeindel

Makefile

@@ -80,9 +80,9 @@ check: $(GOIMPORTS) $(GOLANGCI_LINT) $(HELM) $(YQ)
 	@bash $(GARDENER_HACK_DIR)/check-charts.sh ./charts
 
 .PHONY: generate
-generate: $(CONTROLLER_GEN) $(EXTENSION_GEN) $(GEN_CRD_API_REFERENCE_DOCS) $(HELM) $(KUSTOMIZE) $(MOCKGEN) $(YQ) $(VGOPATH)
-	@VGOPATH=$(VGOPATH) REPO_ROOT=$(REPO_ROOT) GARDENER_HACK_DIR=$(GARDENER_HACK_DIR) hack/update-codegen.sh
-	@VGOPATH=$(VGOPATH) REPO_ROOT=$(REPO_ROOT) GARDENER_HACK_DIR=$(GARDENER_HACK_DIR) bash $(GARDENER_HACK_DIR)/generate-sequential.sh ./charts/... ./cmd/... ./example/... ./pkg/... ./test/...
+generate: $(CONTROLLER_GEN) $(EXTENSION_GEN) $(GEN_CRD_API_REFERENCE_DOCS) $(HELM) $(KUSTOMIZE) $(MOCKGEN) $(YQ)
+	@REPO_ROOT=$(REPO_ROOT) GARDENER_HACK_DIR=$(GARDENER_HACK_DIR) hack/update-codegen.sh
+	@REPO_ROOT=$(REPO_ROOT) GARDENER_HACK_DIR=$(GARDENER_HACK_DIR) bash $(GARDENER_HACK_DIR)/generate-sequential.sh ./charts/... ./cmd/... ./example/... ./pkg/... ./test/...
 	@$(MAKE) format
 
 .PHONY: format

hack/update-codegen.sh

@@ -11,14 +11,10 @@ set -o pipefail
 
 PROJECT_ROOT="$(dirname $0)"/..
 
-# setup virtual GOPATH
-source "$GARDENER_HACK_DIR"/vgopath-setup.sh
-
+go mod download k8s.io/code-generator
 CODE_GEN_DIR=$(go list -m -f '{{.Dir}}' k8s.io/code-generator)
 source "${CODE_GEN_DIR}/kube_codegen.sh"
 
-rm -f $GOPATH/bin/*-gen
-
 kube::codegen::gen_helpers \
   --boilerplate "${GARDENER_HACK_DIR}/LICENSE_BOILERPLATE.txt" \
     --extra-peer-dir k8s.io/apimachinery/pkg/apis/meta/v1 \