update black to 21.6b0 (#10197)

Reformat all files with the new version.

Signed-off-by: Marcus Hoffmann <bubu@bubu1.eu>

changelog.d/10197.misc

@@ -0,0 +1 @@
+Upgrade `black` linting tool to 21.6b0.

setup.py

@@ -97,7 +97,7 @@ CONDITIONAL_REQUIREMENTS["all"] = list(ALL_OPTIONAL_REQUIREMENTS)
 # We pin black so that our tests don't start failing on new releases.
 CONDITIONAL_REQUIREMENTS["lint"] = [
     "isort==5.7.0",
-    "black==20.8b1",
+    "black==21.6b0",
     "flake8-comprehensions",
     "flake8-bugbear==21.3.2",
     "flake8",

synapse/replication/tcp/handler.py

@@ -571,7 +571,7 @@ class ReplicationCommandHandler:
     def on_REMOTE_SERVER_UP(
         self, conn: IReplicationConnection, cmd: RemoteServerUpCommand
     ):
-        """"Called when get a new REMOTE_SERVER_UP command."""
+        """Called when get a new REMOTE_SERVER_UP command."""
         self._replication_data_handler.on_remote_server_up(cmd.data)
 
         self._notifier.notify_remote_server_up(cmd.data)