Import from collections.abc wherever possible (#7635)

stdlib/tkinter/filedialog.pyi

@@ -1,7 +1,8 @@
 import sys
 from _typeshed import StrOrBytesPath
+from collections.abc import Iterable
 from tkinter import Button, Entry, Frame, Listbox, Misc, Scrollbar, StringVar, Toplevel, commondialog
-from typing import IO, Any, ClassVar, Iterable
+from typing import IO, Any, ClassVar
 from typing_extensions import Literal
 
 if sys.version_info >= (3, 9):