remove unused import

Summary: remove unused import

Reviewed By: quark-zju

Differential Revision: D43659296

fbshipit-source-id: 04016e223acd925bcaa46870e739105da23144b5

Author: Liubov Dmitrieva

eden/scm/lib/commitcloudsubscriber/src/subscriber.rs

@@ -12,7 +12,6 @@ use std::sync::atomic::Ordering;
 use std::sync::mpsc;
 use std::sync::Arc;
 use std::time::Duration;
-use std::time::SystemTime;
 
 use anyhow::bail;
 use anyhow::Result;