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, 8 insertions, 2 deletions

diff --git a/tests/rest/client/test_shadow_banned.py b/tests/rest/client/test_shadow_banned.py
index 0ebdf1415b..d2cce44032 100644
--- a/tests/rest/client/test_shadow_banned.py
+++ b/tests/rest/client/test_shadow_banned.py
@@ -260,7 +260,10 @@ class ProfileTestCase(_ShadowBannedBase):
         message_handler = self.hs.get_message_handler()
         event = self.get_success(
             message_handler.get_room_data(
-                self.banned_user_id, room_id, "m.room.member", self.banned_user_id,
+                self.banned_user_id,
+                room_id,
+                "m.room.member",
+                self.banned_user_id,
             )
         )
         self.assertEqual(
@@ -292,7 +295,10 @@ class ProfileTestCase(_ShadowBannedBase):
         message_handler = self.hs.get_message_handler()
         event = self.get_success(
             message_handler.get_room_data(
-                self.banned_user_id, room_id, "m.room.member", self.banned_user_id,
+                self.banned_user_id,
+                room_id,
+                "m.room.member",
+                self.banned_user_id,
             )
         )
         self.assertEqual(