Upgrade black version (#7089)

stdlib/email/_header_value_parser.pyi

@@ -312,8 +312,10 @@ if sys.version_info >= (3, 8):
         token_type: str
         as_ew_allowed: bool
         def fold(self, policy: Policy) -> str: ...
+
     class MessageID(MsgID):
         token_type: str
+
     class InvalidMessageID(MessageID):
         token_type: str
 

stdlib/email/headerregistry.pyi

@@ -132,6 +132,7 @@ class ContentTransferEncodingHeader:
 
 if sys.version_info >= (3, 8):
     from email._header_value_parser import MessageID
+
     class MessageIDHeader:
         max_count: ClassVar[Literal[1]]
         @classmethod