[Bug] CI test failure on arm about r2d2 HOT 4 OPEN

Index: r2d2/src/test.rs
===================================================================
--- r2d2.orig/src/test.rs
+++ r2d2/src/test.rs
@@ -486,10 +486,10 @@ fn test_max_lifetime() {
         .build(Handler(AtomicIsize::new(5)))
         .unwrap();
     let conn = pool.get().unwrap();
-    thread::sleep(Duration::from_secs(2));
+    thread::sleep(Duration::from_secs(3));
     assert_eq!(4, DROPPED.load(Ordering::SeqCst));
     drop(conn);
-    thread::sleep(Duration::from_secs(2));
+    thread::sleep(Duration::from_secs(3));
     assert_eq!(5, DROPPED.load(Ordering::SeqCst));
     assert!(pool.get().is_err());
 }