revert(typing): remove unnecessary model_post_init typing

Author: marcusmotill

src/google/adk/events/event.py

@@ -15,7 +15,6 @@
 from __future__ import annotations
 
 from typing import Optional
-from typing import Any
 from typing import cast
 
 from google.adk.platform import time as platform_time
@@ -75,7 +74,7 @@ class Event(LlmResponse):
   timestamp: float = Field(default_factory=lambda: platform_time.get_time())
   """The timestamp of the event."""
 
-  def model_post_init(self, __context: Any) -> None:
+  def model_post_init(self, __context):
     """Post initialization logic for the event."""
     # Generates a random ID for the event.
     if not self.id: