Update gnostic references

Kubernetes-commit: 2111e79f56acdfa6a8dab56780c52e3abc608758

Author: Jefftree

pkg/util/openapi/proto.go

@@ -19,7 +19,7 @@ package openapi
 import (
 "encoding/json"
 
-openapi_v2 "github.com/google/gnostic/openapiv2"
+openapi_v2 "github.com/google/gnostic-models/openapiv2"
 
 "k8s.io/kube-openapi/pkg/util/proto"
 "k8s.io/kube-openapi/pkg/validation/spec"