Update config/config.sample.json

Co-authored-by: fkwp <fkwp@users.noreply.github.com>

config/config.sample.json

@@ -16,6 +16,6 @@
     "wait_for_key_rotation_ms": 3000,
     "membership_event_expiry_ms": 6000000,
     "delayed_leave_event_delay_ms": 18000,
-    "delayed_leave_event_restart_ms": 5000
+    "delayed_leave_event_restart_ms": 4000
   }
 }