Upgrade black version (#7089)

stdlib/ftplib.pyi

@@ -62,6 +62,7 @@ class FTP:
             timeout: float = ...,
             source_address: tuple[str, int] | None = ...,
         ) -> None: ...
+
     def connect(
         self, host: str = ..., port: int = ..., timeout: float = ..., source_address: tuple[str, int] | None = ...
     ) -> str: ...