docs: refformated with black

Author: caiquilipe

broadcaster/_backends/redis.py

@@ -40,7 +40,9 @@ async def publish(self, channel: str, message: Any) -> None:
     async def next_published(self) -> Event:
         message = None
         while not message:
-            message = await self._sub_conn.get_message(ignore_subscribe_messages=True, timeout=None)
+            message = await self._sub_conn.get_message(
+                ignore_subscribe_messages=True, timeout=None
+            )
         event = Event(
             channel=message["channel"].decode(),
             message=message["data"].decode(),