Update code-generator to v0.26.0

vendor/k8s.io/kube-openapi/pkg/validation/spec/ref.go

@@ -21,6 +21,8 @@ import (
 	"path/filepath"
 
 	"github.com/go-openapi/jsonreference"
+
+	"k8s.io/kube-openapi/pkg/internal"
 )
 
 // Refable is a struct for things that accept a $ref property
@@ -149,19 +151,5 @@ func (r *Ref) UnmarshalJSON(d []byte) error {
 }
 
 func (r *Ref) fromMap(v map[string]interface{}) error {
-	if v == nil {
-		return nil
-	}
-
-	if vv, ok := v["$ref"]; ok {
-		if str, ok := vv.(string); ok {
-			ref, err := jsonreference.New(str)
-			if err != nil {
-				return err
-			}
-			*r = Ref{Ref: ref}
-		}
-	}
-
-	return nil
+	return internal.JSONRefFromMap(&r.Ref, v)
 }