fix: disable save_input_blobs_as_artifacts deprecation warning message for users that don't set it

PiperOrigin-RevId: 861738532

Author: google-genai-bot

src/google/adk/runners.py

@@ -1474,11 +1474,14 @@ async def _handle_new_message(
       invocation_context.user_content = new_message
 
     if new_message:
+      deprecated_save_blobs = False
+      if 'save_input_blobs_as_artifacts' in run_config.model_fields_set:
+        deprecated_save_blobs = run_config.save_input_blobs_as_artifacts
       await self._append_new_message_to_session(
           session=session,
           new_message=new_message,
           invocation_context=invocation_context,
-          save_input_blobs_as_artifacts=run_config.save_input_blobs_as_artifacts,
+          save_input_blobs_as_artifacts=deprecated_save_blobs,
           state_delta=state_delta,
       )