fix(dispatcher): handle asyncio.CancelledError in handler tasks

Author: SychO3

pyrogram/dispatcher.py

@@ -328,7 +328,10 @@ async def stop(self, clear_handlers: bool = True):
                 self.updates_queue.put_nowait(None)
 
             for i in self.handler_worker_tasks:
-                await i
+                try:
+                    await i
+                except asyncio.CancelledError:
+                    pass
 
             self.handler_worker_tasks.clear()
             self.locks_list.clear()