fix TypedDict as per tests

Author: paulnoirel

libs/labelbox/src/labelbox/schema/project_overview.py

@@ -1,5 +1,6 @@
-from typing import Dict, List, TypedDict
+from typing import Dict, List
 from labelbox.pydantic_compat import BaseModel
+from typing_extensions import TypedDict
 
 class ProjectOverview(BaseModel):
     """