Remove list return type from _BaseNetwork.hosts

Per python/cpython#141497 (comment)

Thanks to @serhiy-storchaka for the notification

Author: srittau

stdlib/ipaddress.pyi

@@ -73,7 +73,7 @@ class _BaseNetwork(_IPAddressBase, Generic[_A]):
     @property
     def broadcast_address(self) -> _A: ...
     def compare_networks(self, other: Self) -> int: ...
-    def hosts(self) -> Iterator[_A] | list[_A]: ...
+    def hosts(self) -> Iterator[_A]: ...
     @property
     def is_global(self) -> bool: ...
     @property