Upgrade black version (#7089)

stubs/urllib3/urllib3/connection.pyi

@@ -11,6 +11,7 @@ if sys.version_info >= (3, 0):
     from http.client import HTTPConnection as _HTTPConnection, HTTPException as HTTPException
 else:
     from httplib import HTTPConnection as _HTTPConnection, HTTPException as HTTPException
+
     class ConnectionError(Exception): ...
 
 _TYPE_BODY = bytes | IO[Any] | Iterable[bytes] | str