Update OpenAPI and fix openAPI tests to handle unexported jsonreferences

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

Kubernetes-commit: 700e3b566428bca46d2d37514c8fd7af60c7ff34

openapi/openapitest/fileclient.go

@@ -94,3 +94,8 @@ func (f *fileGroupVersion) Schema(contentType string) ([]byte, error) {
 	}
 	return fs.ReadFile(f.f, f.filename)
 }
+
+// ServerRelativeURL returns an empty string.
+func (f *fileGroupVersion) ServerRelativeURL() string {
+	return f.filename
+}