Update k8s dependency version to 1.21

Signed-off-by: xinyanwu409 <wxinyan@vmware>

vendor/k8s.io/apimachinery/pkg/runtime/serializer/protobuf/protobuf.go

@@ -120,7 +120,7 @@ func (s *Serializer) Decode(originalData []byte, gvk *schema.GroupVersionKind, i
 
 	if intoUnknown, ok := into.(*runtime.Unknown); ok && intoUnknown != nil {
 		*intoUnknown = unk
-		if ok, _, _ := s.RecognizesData(bytes.NewBuffer(unk.Raw)); ok {
+		if ok, _, _ := s.RecognizesData(unk.Raw); ok {
 			intoUnknown.ContentType = runtime.ContentTypeProtobuf
 		}
 		return intoUnknown, &actual, nil
@@ -245,19 +245,8 @@ func (s *Serializer) Identifier() runtime.Identifier {
 }
 
 // RecognizesData implements the RecognizingDecoder interface.
-func (s *Serializer) RecognizesData(peek io.Reader) (bool, bool, error) {
-	prefix := make([]byte, 4)
-	n, err := peek.Read(prefix)
-	if err != nil {
-		if err == io.EOF {
-			return false, false, nil
-		}
-		return false, false, err
-	}
-	if n != 4 {
-		return false, false, nil
-	}
-	return bytes.Equal(s.prefix, prefix), false, nil
+func (s *Serializer) RecognizesData(data []byte) (bool, bool, error) {
+	return bytes.HasPrefix(data, s.prefix), false, nil
 }
 
 // copyKindDefaults defaults dst to the value in src if dst does not have a value set.