Fix mypy type annotations in transformation.py

- Add explicit type annotation for transformed_message dict
- Resolves mypy errors while maintaining functionality
- All tests continue to pass

Author: timelfrink

litellm/llms/bedrock/count_tokens/transformation.py

@@ -92,7 +92,7 @@ def _transform_to_converse_format(
                 system_messages.append({"text": message.get("content", "")})
             else:
                 # Transform message content to Bedrock format
-                transformed_message = {"role": message.get("role"), "content": []}
+                transformed_message: Dict[str, Any] = {"role": message.get("role"), "content": []}
 
                 # Handle content - ensure it's in the correct array format
                 content = message.get("content", "")