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, 3 insertions, 6 deletions

diff --git a/tests/storage/test_redaction.py b/tests/storage/test_redaction.py
index a6303bf0ee..b2a0e60856 100644
--- a/tests/storage/test_redaction.py
+++ b/tests/storage/test_redaction.py
@@ -299,8 +299,7 @@ class RedactionTestCase(unittest.HomeserverTestCase):
         )
 
     def test_redact_censor(self):
-        """Test that a redacted event gets censored in the DB after a month
-        """
+        """Test that a redacted event gets censored in the DB after a month"""
 
         self.get_success(
             self.inject_room_member(self.room1, self.u_alice, Membership.JOIN)
@@ -370,8 +369,7 @@ class RedactionTestCase(unittest.HomeserverTestCase):
         self.assert_dict({"content": {}}, json.loads(event_json))
 
     def test_redact_redaction(self):
-        """Tests that we can redact a redaction and can fetch it again.
-        """
+        """Tests that we can redact a redaction and can fetch it again."""
 
         self.get_success(
             self.inject_room_member(self.room1, self.u_alice, Membership.JOIN)
@@ -404,8 +402,7 @@ class RedactionTestCase(unittest.HomeserverTestCase):
         )
 
     def test_store_redacted_redaction(self):
-        """Tests that we can store a redacted redaction.
-        """
+        """Tests that we can store a redacted redaction."""
 
         self.get_success(
             self.inject_room_member(self.room1, self.u_alice, Membership.JOIN)