Update OpenAPI and fix openAPI tests to handle unexported jsonreferences

Co-authored-by: Alexander Zielensk <alexzielenski@gmail.com>

Kubernetes-commit: 700e3b566428bca46d2d37514c8fd7af60c7ff34

openapi/cached/groupversion.go

@@ -56,3 +56,7 @@ func (g *groupversion) Schema(contentType string) ([]byte, error) {
 
 	return cachedInfo.data, cachedInfo.err
 }
+
+func (c *groupversion) ServerRelativeURL() string {
+	return c.delegate.ServerRelativeURL()
+}