Update black, and run auto formatting over the codebase (#9381)

- Update black version to the latest
 - Run black auto formatting over the codebase
    - Run autoformatting according to [`docs/code_style.md
`](80d6dc9783/docs/code_style.md)
 - Update `code_style.md` docs around installing black to use the correct version

synapse/replication/tcp/handler.py

@@ -303,7 +303,9 @@ class ReplicationCommandHandler:
                 hs, outbound_redis_connection
             )
             hs.get_reactor().connectTCP(
-                hs.config.redis.redis_host, hs.config.redis.redis_port, self._factory,
+                hs.config.redis.redis_host,
+                hs.config.redis.redis_port,
+                self._factory,
             )
         else:
             client_name = hs.get_instance_name()
@@ -313,13 +315,11 @@ class ReplicationCommandHandler:
             hs.get_reactor().connectTCP(host, port, self._factory)
 
     def get_streams(self) -> Dict[str, Stream]:
-        """Get a map from stream name to all streams.
-        """
+        """Get a map from stream name to all streams."""
         return self._streams
 
     def get_streams_to_replicate(self) -> List[Stream]:
-        """Get a list of streams that this instances replicates.
-        """
+        """Get a list of streams that this instances replicates."""
         return self._streams_to_replicate
 
     def on_REPLICATE(self, conn: AbstractConnection, cmd: ReplicateCommand):
@@ -340,7 +340,10 @@ class ReplicationCommandHandler:
             current_token = stream.current_token(self._instance_name)
             self.send_command(
                 PositionCommand(
-                    stream.NAME, self._instance_name, current_token, current_token,
+                    stream.NAME,
+                    self._instance_name,
+                    current_token,
+                    current_token,
                 )
             )
 
@@ -592,8 +595,7 @@ class ReplicationCommandHandler:
         self.send_command(cmd, ignore_conn=conn)
 
     def new_connection(self, connection: AbstractConnection):
-        """Called when we have a new connection.
-        """
+        """Called when we have a new connection."""
         self._connections.append(connection)
 
         # If we are connected to replication as a client (rather than a server)
@@ -620,8 +622,7 @@ class ReplicationCommandHandler:
             )
 
     def lost_connection(self, connection: AbstractConnection):
-        """Called when a connection is closed/lost.
-        """
+        """Called when a connection is closed/lost."""
         # we no longer need _streams_by_connection for this connection.
         streams = self._streams_by_connection.pop(connection, None)
         if streams:
@@ -678,15 +679,13 @@ class ReplicationCommandHandler:
     def send_user_sync(
         self, instance_id: str, user_id: str, is_syncing: bool, last_sync_ms: int
     ):
-        """Poke the master that a user has started/stopped syncing.
-        """
+        """Poke the master that a user has started/stopped syncing."""
         self.send_command(
             UserSyncCommand(instance_id, user_id, is_syncing, last_sync_ms)
         )
 
     def send_remove_pusher(self, app_id: str, push_key: str, user_id: str):
-        """Poke the master to remove a pusher for a user
-        """
+        """Poke the master to remove a pusher for a user"""
         cmd = RemovePusherCommand(app_id, push_key, user_id)
         self.send_command(cmd)
 
@@ -699,8 +698,7 @@ class ReplicationCommandHandler:
         device_id: str,
         last_seen: int,
     ):
-        """Tell the master that the user made a request.
-        """
+        """Tell the master that the user made a request."""
         cmd = UserIpCommand(user_id, access_token, ip, user_agent, device_id, last_seen)
         self.send_command(cmd)