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, 2 deletions

diff --git a/synapse/rest/client/v2_alpha/relations.py b/synapse/rest/client/v2_alpha/relations.py
index 18c75738f8..fe765da23c 100644
--- a/synapse/rest/client/v2_alpha/relations.py
+++ b/synapse/rest/client/v2_alpha/relations.py
@@ -244,7 +244,9 @@ class RelationAggregationPaginationServlet(RestServlet):
         requester = await self.auth.get_user_by_req(request, allow_guest=True)
 
         await self.auth.check_user_in_room_or_world_readable(
-            room_id, requester.user.to_string(), allow_departed_users=True,
+            room_id,
+            requester.user.to_string(),
+            allow_departed_users=True,
         )
 
         # This checks that a) the event exists and b) the user is allowed to
@@ -322,7 +324,9 @@ class RelationAggregationGroupPaginationServlet(RestServlet):
         requester = await self.auth.get_user_by_req(request, allow_guest=True)
 
         await self.auth.check_user_in_room_or_world_readable(
-            room_id, requester.user.to_string(), allow_departed_users=True,
+            room_id,
+            requester.user.to_string(),
+            allow_departed_users=True,
         )
 
         # This checks that a) the event exists and b) the user is allowed to