using Union instead of | to make the mypy test pass

autogen/messages/agent_messages.py

@@ -4,7 +4,7 @@
 
 from abc import ABC
 from copy import deepcopy
-from typing import TYPE_CHECKING, Any, Callable, Literal, Optional, Union
+from typing import TYPE_CHECKING, Any, Callable, Dict, List, Literal, Optional, Union
 from uuid import UUID
 
 from pydantic import BaseModel
@@ -189,7 +189,7 @@ def print(self, f: Optional[Callable[..., Any]] = None) -> None:
 
 @wrap_message
 class TextMessage(BasePrintReceivedMessage):
-    content: Optional[Union[str, int, float, bool, list[dict[str, str | dict[str, Any]]]]] = None  # type: ignore [assignment]
+    content: Optional[Union[str, int, float, bool, List[Dict[str, Union[str, Dict[str, Any]]]]]] = None  # type: ignore [assignment]
 
     def print(self, f: Optional[Callable[..., Any]] = None) -> None:
         f = f or print