Upgrade black to 20.8b1 (#39287)

tests/components/conftest.py

@@ -15,6 +15,7 @@ zeroconf.install_multiple_zeroconf_catcher = lambda zc: None
 def prevent_io():
     """Fixture to prevent certain I/O from happening."""
     with patch(
-        "homeassistant.components.http.ban.async_load_ip_bans_config", return_value=[],
+        "homeassistant.components.http.ban.async_load_ip_bans_config",
+        return_value=[],
     ):
         yield