Update dependencies (#5574)

Update vendor

vendor/k8s.io/kube-openapi/pkg/handler3/handler.go

@@ -40,8 +40,9 @@ import (
 )
 
 const (
-	subTypeProtobuf = "com.github.proto-openapi.spec.v3@v1.0+protobuf"
-	subTypeJSON     = "json"
+	subTypeProtobufDeprecated = "com.github.proto-openapi.spec.v3@v1.0+protobuf"
+	subTypeProtobuf           = "com.github.proto-openapi.spec.v3.v1.0+protobuf"
+	subTypeJSON               = "json"
 )
 
 // OpenAPIV3Discovery is the format of the Discovery document for OpenAPI V3
@@ -140,7 +141,7 @@ func (o *OpenAPIService) getSingleGroupBytes(getType string, group string) ([]by
 		}
 		etagBytes, err := v.etagCache.Get()
 		return specBytes, string(etagBytes), v.lastModified, err
-	} else if getType == subTypeProtobuf {
+	} else if getType == subTypeProtobuf || getType == subTypeProtobufDeprecated {
 		specPb, err := v.pbCache.Get()
 		if err != nil {
 			return nil, "", v.lastModified, err
@@ -198,11 +199,13 @@ func (o *OpenAPIService) HandleGroupVersion(w http.ResponseWriter, r *http.Reque
 	}
 
 	accepted := []struct {
-		Type    string
-		SubType string
+		Type                string
+		SubType             string
+		ReturnedContentType string
 	}{
-		{"application", subTypeJSON},
-		{"application", subTypeProtobuf},
+		{"application", subTypeJSON, "application/" + subTypeJSON},
+		{"application", subTypeProtobuf, "application/" + subTypeProtobuf},
+		{"application", subTypeProtobufDeprecated, "application/" + subTypeProtobuf},
 	}
 
 	for _, clause := range clauses {
@@ -217,6 +220,9 @@ func (o *OpenAPIService) HandleGroupVersion(w http.ResponseWriter, r *http.Reque
 			if err != nil {
 				return
 			}
+			// Set Content-Type header in the reponse
+			w.Header().Set("Content-Type", accepts.ReturnedContentType)
+
 			// ETag must be enclosed in double quotes: https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/ETag
 			w.Header().Set("Etag", strconv.Quote(etag))