Simplify update-vendor.sh to use go work sync

Author: liggitt

hack/make-rules/update.sh

@@ -36,7 +36,6 @@ if ! ${ALL} ; then
 fi
 
 BASH_TARGETS=(
-	update-go-workspace
 	update-codegen
 	update-generated-api-compatibility-data
 	update-generated-docs

hack/update-go-workspace.sh

@@ -55,7 +55,6 @@ fi
 
 ./hack/update-vendor.sh
 ./hack/update-internal-modules.sh
-./hack/update-go-workspace.sh
 ./hack/lint-dependencies.sh
 
 sed -i'' -e "s/const kustomizeVersion.*$/const kustomizeVersion = \"${LATEST_KUSTOMIZE}\"/" staging/src/k8s.io/kubectl/pkg/cmd/version/version.go