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, 14 insertions, 6 deletions

diff --git a/tests/handlers/test_directory.py b/tests/handlers/test_directory.py
index a39f898608..863d8737b2 100644
--- a/tests/handlers/test_directory.py
+++ b/tests/handlers/test_directory.py
@@ -131,7 +131,9 @@ class TestCreateAlias(unittest.HomeserverTestCase):
         """A user can create an alias for a room they're in."""
         self.get_success(
             self.handler.create_association(
-                create_requester(self.test_user), self.room_alias, self.room_id,
+                create_requester(self.test_user),
+                self.room_alias,
+                self.room_id,
             )
         )
 
@@ -143,7 +145,9 @@ class TestCreateAlias(unittest.HomeserverTestCase):
 
         self.get_failure(
             self.handler.create_association(
-                create_requester(self.test_user), self.room_alias, other_room_id,
+                create_requester(self.test_user),
+                self.room_alias,
+                other_room_id,
             ),
             synapse.api.errors.SynapseError,
         )
@@ -156,7 +160,9 @@ class TestCreateAlias(unittest.HomeserverTestCase):
 
         self.get_success(
             self.handler.create_association(
-                create_requester(self.admin_user), self.room_alias, other_room_id,
+                create_requester(self.admin_user),
+                self.room_alias,
+                other_room_id,
             )
         )
 
@@ -275,8 +281,7 @@ class TestDeleteAlias(unittest.HomeserverTestCase):
 
 
 class CanonicalAliasTestCase(unittest.HomeserverTestCase):
-    """Test modifications of the canonical alias when delete aliases.
-    """
+    """Test modifications of the canonical alias when delete aliases."""
 
     servlets = [
         synapse.rest.admin.register_servlets,
@@ -317,7 +322,10 @@ class CanonicalAliasTestCase(unittest.HomeserverTestCase):
     def _set_canonical_alias(self, content):
         """Configure the canonical alias state on the room."""
         self.helper.send_state(
-            self.room_id, "m.room.canonical_alias", content, tok=self.admin_user_tok,
+            self.room_id,
+            "m.room.canonical_alias",
+            content,
+            tok=self.admin_user_tok,
         )
 
     def _get_canonical_alias(self):