fixing type hint

Author: Eldies

datumaro/plugins/datumaro_format/extractor.py

@@ -3,6 +3,7 @@
 # SPDX-License-Identifier: MIT
 
 import os.path as osp
+from typing import Union
 
 from datumaro.components.annotation import (
     AnnotationType,
@@ -269,7 +270,7 @@ def _load_annotations(self, item: dict):
         return loaded
 
     def _load_skeleton_elements_annotations(
-        self, ann: dict, label_id: int, points: list[float | int]
+        self, ann: dict, label_id: int, points: list[Union[float, int]]
     ) -> list[Points]:
         if len(points) % 3 != 0:
             raise InvalidAnnotationError(