Fix field name for auth_config -> authConfig in calendar agent

Author: pstephengoogle

examples/google_adk/calendar_agent/adk_agent_executor.py

@@ -318,7 +318,7 @@ def get_auth_config(
 ) -> AuthConfig:
     """Extracts the AuthConfig object from the arguments of the auth request function call."""
     if not auth_request_function_call.args or not (
-        auth_config := auth_request_function_call.args.get('auth_config')
+        auth_config := auth_request_function_call.args.get('authConfig')
     ):
         raise ValueError(
             f'Cannot get auth config from function call: {auth_request_function_call}'