fix function calling examples

src/pipecat/frames/frames.py

@@ -4,7 +4,7 @@
 # SPDX-License-Identifier: BSD 2-Clause License
 #
 
-from typing import Any, List, Mapping, Tuple, Optional
+from typing import Any, List, Mapping, Optional, Tuple
 
 from dataclasses import dataclass, field
 
@@ -419,7 +419,7 @@ class TTSStoppedFrame(ControlFrame):
 class UserImageRequestFrame(ControlFrame):
     """A frame user to request an image from the given user."""
     user_id: str
-    context: Optional[any]
+    context: Optional[Any] = None
 
     def __str__(self):
         return f"{self.name}, user: {self.user_id}"