Remove defunct references to "vendor"

hack/verify-netparse-cve.sh

@@ -41,7 +41,6 @@ find_files() {
         -o -wholename './target' \
         -o -wholename '*/third_party/*' \
         -o -wholename '*/vendor/*' \
-        -o -wholename './staging/src/k8s.io/client-go/*vendor/*' \
       \) -prune \
     \) -name '*.go'
 }