psutil: Fix win_service_iter() return type to allow iterating over its result (#8932)

stubs/psutil/psutil/_pswindows.pyi

@@ -1,4 +1,5 @@
 import enum
+from collections.abc import Iterable
 from typing import Any, NamedTuple
 
 from ._common import (
@@ -122,7 +123,7 @@ def net_if_addrs(): ...
 def sensors_battery(): ...
 def boot_time(): ...
 def users(): ...
-def win_service_iter() -> None: ...
+def win_service_iter() -> Iterable[WindowsService]: ...
 def win_service_get(name): ...
 
 class WindowsService: