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
`](80d6dc9783/docs/code_style.md)
 - Update `code_style.md` docs around installing black to use the correct version

synapse/replication/tcp/streams/_base.py

@@ -183,7 +183,10 @@ class Stream:
             return [], upto_token, False
 
         updates, upto_token, limited = await self.update_function(
-            instance_name, from_token, upto_token, _STREAM_UPDATE_TARGET_ROW_COUNT,
+            instance_name,
+            from_token,
+            upto_token,
+            _STREAM_UPDATE_TARGET_ROW_COUNT,
         )
         return updates, upto_token, limited
 
@@ -339,8 +342,7 @@ class ReceiptsStream(Stream):
 
 
 class PushRulesStream(Stream):
-    """A user has changed their push rules
-    """
+    """A user has changed their push rules"""
 
     PushRulesStreamRow = namedtuple("PushRulesStreamRow", ("user_id",))  # str
 
@@ -362,8 +364,7 @@ class PushRulesStream(Stream):
 
 
 class PushersStream(Stream):
-    """A user has added/changed/removed a pusher
-    """
+    """A user has added/changed/removed a pusher"""
 
     PushersStreamRow = namedtuple(
         "PushersStreamRow",
@@ -416,8 +417,7 @@ class CachesStream(Stream):
 
 
 class PublicRoomsStream(Stream):
-    """The public rooms list changed
-    """
+    """The public rooms list changed"""
 
     PublicRoomsStreamRow = namedtuple(
         "PublicRoomsStreamRow",
@@ -463,8 +463,7 @@ class DeviceListsStream(Stream):
 
 
 class ToDeviceStream(Stream):
-    """New to_device messages for a client
-    """
+    """New to_device messages for a client"""
 
     ToDeviceStreamRow = namedtuple("ToDeviceStreamRow", ("entity",))  # str
 
@@ -481,8 +480,7 @@ class ToDeviceStream(Stream):
 
 
 class TagAccountDataStream(Stream):
-    """Someone added/removed a tag for a room
-    """
+    """Someone added/removed a tag for a room"""
 
     TagAccountDataStreamRow = namedtuple(
         "TagAccountDataStreamRow", ("user_id", "room_id", "data")  # str  # str  # dict
@@ -501,8 +499,7 @@ class TagAccountDataStream(Stream):
 
 
 class AccountDataStream(Stream):
-    """Global or per room account data was changed
-    """
+    """Global or per room account data was changed"""
 
     AccountDataStreamRow = namedtuple(
         "AccountDataStream",
@@ -589,8 +586,7 @@ class GroupServerStream(Stream):
 
 
 class UserSignatureStream(Stream):
-    """A user has signed their own device with their user-signing key
-    """
+    """A user has signed their own device with their user-signing key"""
 
     UserSignatureStreamRow = namedtuple("UserSignatureStreamRow", ("user_id"))  # str