feat(scheduler) fix rustc warning

backend/server/src/scheduler/tasks/mod.rs

@@ -2,7 +2,10 @@ use std::pin::Pin;
 
 use chrono::{DateTime, Utc};
 
+#[allow(dead_code)]
 pub mod async_basic;
+
+#[allow(dead_code)]
 pub mod basic;
 
 pub trait CronTask: Send + Sync {