validation: use to_string instead of format

validation/src/create_submission.rs

@@ -40,7 +40,7 @@ impl crate::message_handler::MessageHandler{
 		if let Err(e)=create_result{
 			self.api.action_operation_failed(submissions_api::types::ActionOperationFailedRequest{
 				OperationID:operation_id,
-				StatusMessage:format!("{e}"),
+				StatusMessage:e.to_string(),
 			}).await?;
 		}