Use PEP 585 syntax wherever possible (#6717)

stdlib/ftplib.pyi

@@ -3,7 +3,7 @@ from _typeshed import Self, SupportsRead, SupportsReadline
 from socket import socket
 from ssl import SSLContext
 from types import TracebackType
-from typing import Any, Callable, Iterable, Iterator, TextIO, Tuple, Type
+from typing import Any, Callable, Iterable, Iterator, TextIO, Type
 from typing_extensions import Literal
 
 MSG_OOB: int
@@ -18,7 +18,7 @@ class error_temp(Error): ...
 class error_perm(Error): ...
 class error_proto(Error): ...
 
-all_errors: Tuple[Type[Exception], ...]
+all_errors: tuple[Type[Exception], ...]
 
 class FTP:
     debugging: int