Refactor event loop for trackbert.py

- Improve conditional check for latest known event timestamp in the event loop.
- Update the index of the `latest_known_event` timestamp from position 3 to position 2 for accurate comparison.
- This ensures that only events with a more recent timestamp are considered.

trackbert.py

@@ -227,7 +227,7 @@ def start_loop(db: sqlite3.Connection, api: KeyDelivery) -> Never:
             logging.debug(f"Latest upstream event for {tracking_number}: {events[0]['context']} - {events[0]['time']}")
 
             for event in events:
-                if latest_known_event is None or event["time"] > latest_known_event[3]:
+                if latest_known_event is None or event["time"] > latest_known_event[2]:
                     create_event(
                         db,
                         shipment_id,