VOL-1917 move to go mod

Change-Id: Ia8de8bd8a4f4d908cc1fa745f6f4ec949629017b
diff --git a/vendor/k8s.io/apimachinery/pkg/runtime/types.go b/vendor/k8s.io/apimachinery/pkg/runtime/types.go
index e4515d8..3d3ebe5 100644
--- a/vendor/k8s.io/apimachinery/pkg/runtime/types.go
+++ b/vendor/k8s.io/apimachinery/pkg/runtime/types.go
@@ -41,7 +41,9 @@
 }
 
 const (
-	ContentTypeJSON string = "application/json"
+	ContentTypeJSON     string = "application/json"
+	ContentTypeYAML     string = "application/yaml"
+	ContentTypeProtobuf string = "application/vnd.kubernetes.protobuf"
 )
 
 // RawExtension is used to hold extensions in external versions.