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, 9 insertions, 12 deletions

diff --git a/tests/replication/test_pusher_shard.py b/tests/replication/test_pusher_shard.py
index 800ad94a04..f118fe32af 100644
--- a/tests/replication/test_pusher_shard.py
+++ b/tests/replication/test_pusher_shard.py
@@ -27,8 +27,7 @@ logger = logging.getLogger(__name__)
 
 
 class PusherShardTestCase(BaseMultiWorkerStreamTestCase):
-    """Checks pusher sharding works
-    """
+    """Checks pusher sharding works"""
 
     servlets = [
         admin.register_servlets_for_client_rest_resource,
@@ -88,11 +87,10 @@ class PusherShardTestCase(BaseMultiWorkerStreamTestCase):
         return event_id
 
     def test_send_push_single_worker(self):
-        """Test that registration works when using a pusher worker.
-        """
+        """Test that registration works when using a pusher worker."""
         http_client_mock = Mock(spec_set=["post_json_get_json"])
-        http_client_mock.post_json_get_json.side_effect = lambda *_, **__: defer.succeed(
-            {}
+        http_client_mock.post_json_get_json.side_effect = (
+            lambda *_, **__: defer.succeed({})
         )
 
         self.make_worker_hs(
@@ -119,11 +117,10 @@ class PusherShardTestCase(BaseMultiWorkerStreamTestCase):
         )
 
     def test_send_push_multiple_workers(self):
-        """Test that registration works when using sharded pusher workers.
-        """
+        """Test that registration works when using sharded pusher workers."""
         http_client_mock1 = Mock(spec_set=["post_json_get_json"])
-        http_client_mock1.post_json_get_json.side_effect = lambda *_, **__: defer.succeed(
-            {}
+        http_client_mock1.post_json_get_json.side_effect = (
+            lambda *_, **__: defer.succeed({})
         )
 
         self.make_worker_hs(
@@ -137,8 +134,8 @@ class PusherShardTestCase(BaseMultiWorkerStreamTestCase):
         )
 
         http_client_mock2 = Mock(spec_set=["post_json_get_json"])
-        http_client_mock2.post_json_get_json.side_effect = lambda *_, **__: defer.succeed(
-            {}
+        http_client_mock2.post_json_get_json.side_effect = (
+            lambda *_, **__: defer.succeed({})
         )
 
         self.make_worker_hs(