Avoid explicitly passing the loop to asyncio

This behaviour is deprecated and will be removed in future versions
of Python. Technically, it could be considered a bug (invalid usage
causing different behaviour from the expected one), and in practice
it should not break much code (because .get_event_loop() would likely
be the same event loop anyway).

telethon/client/updates.py

@@ -326,7 +326,7 @@ class UpdateMethods:
         while self.is_connected():
             try:
                 await asyncio.wait_for(
-                    self.disconnected, timeout=60, loop=self._loop
+                    self.disconnected, timeout=60
                 )
                 continue  # We actually just want to act upon timeout
             except asyncio.TimeoutError: