stdlib/@python2: clean imports (#5453)

stdlib/@python2/zipfile.pyi

@@ -1,24 +1,7 @@
 import io
-import sys
 from _typeshed import StrPath
 from types import TracebackType
-from typing import (
-    IO,
-    Any,
-    Callable,
-    Dict,
-    Iterable,
-    Iterator,
-    List,
-    Optional,
-    Pattern,
-    Protocol,
-    Sequence,
-    Text,
-    Tuple,
-    Type,
-    Union,
-)
+from typing import IO, Any, Callable, Dict, Iterable, List, Optional, Pattern, Protocol, Sequence, Text, Tuple, Type, Union
 
 _SZI = Union[Text, ZipInfo]
 _DT = Tuple[int, int, int, int, int, int]