style: drop useless object inheritance

gns3server/db/tasks.py

@@ -252,7 +252,7 @@ class EventHandler(PatternMatchingEventHandler):
         self._loop.call_soon_threadsafe(self._queue.put_nowait, event)
 
 
-class EventIterator(object):
+class EventIterator:
     """
     Watchdog Event iterator.
     """