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
`](https://github.com/matrix-org/synapse/blob/80d6dc9783aa80886a133756028984dbf8920168/docs/code_style.md)
 - Update `code_style.md` docs around installing black to use the correct version

1 files changed, 6 insertions, 5 deletions

diff --git a/tests/handlers/test_password_providers.py b/tests/handlers/test_password_providers.py
index f816594ee4..a98a65ae67 100644
--- a/tests/handlers/test_password_providers.py
+++ b/tests/handlers/test_password_providers.py
@@ -231,8 +231,7 @@ class PasswordAuthProviderTests(unittest.HomeserverTestCase):
         }
     )
     def test_no_local_user_fallback_login(self):
-        """localdb_enabled can block login with the local password
-        """
+        """localdb_enabled can block login with the local password"""
         self.register_user("localuser", "localpass")
 
         # check_password must return an awaitable
@@ -251,8 +250,7 @@ class PasswordAuthProviderTests(unittest.HomeserverTestCase):
         }
     )
     def test_no_local_user_fallback_ui_auth(self):
-        """localdb_enabled can block ui auth with the local password
-        """
+        """localdb_enabled can block ui auth with the local password"""
         self.register_user("localuser", "localpass")
 
         # allow login via the auth provider
@@ -594,7 +592,10 @@ class PasswordAuthProviderTests(unittest.HomeserverTestCase):
         )
 
     def _delete_device(
-        self, access_token: str, device: str, body: Union[JsonDict, bytes] = b"",
+        self,
+        access_token: str,
+        device: str,
+        body: Union[JsonDict, bytes] = b"",
     ) -> FakeChannel:
         """Delete an individual device."""
         channel = self.make_request(