Update go mod and vendor in client dir to 0.28.0

client/vendor/k8s.io/kube-openapi/pkg/spec3/operation.go

@@ -20,6 +20,8 @@ import (
 	"encoding/json"
 
 	"github.com/go-openapi/swag"
+	"k8s.io/kube-openapi/pkg/internal"
+	jsonv2 "k8s.io/kube-openapi/pkg/internal/third_party/go-json-experiment/json"
 	"k8s.io/kube-openapi/pkg/validation/spec"
 )
 
@@ -46,12 +48,28 @@ func (o *Operation) MarshalJSON() ([]byte, error) {
 
 // UnmarshalJSON hydrates this items instance with the data from JSON
 func (o *Operation) UnmarshalJSON(data []byte) error {
+	if internal.UseOptimizedJSONUnmarshalingV3 {
+		return jsonv2.Unmarshal(data, o)
+	}
 	if err := json.Unmarshal(data, &o.OperationProps); err != nil {
 		return err
 	}
 	return json.Unmarshal(data, &o.VendorExtensible)
 }
 
+func (o *Operation) UnmarshalNextJSON(opts jsonv2.UnmarshalOptions, dec *jsonv2.Decoder) error {
+	var x struct {
+		spec.Extensions
+		OperationProps
+	}
+	if err := opts.UnmarshalNext(dec, &x); err != nil {
+		return err
+	}
+	o.Extensions = internal.SanitizeExtensions(x.Extensions)
+	o.OperationProps = x.OperationProps
+	return nil
+}
+
 // OperationProps describes a single API operation on a path, more at https://github.com/OAI/OpenAPI-Specification/blob/master/versions/3.0.0.md#operationObject
 type OperationProps struct {
 	// Tags holds a list of tags for API documentation control