typing: Gtk4: Fix wrong Gtk.Widget.get_ancestor signature (#217)

Author: really-not-lavacat

src/gi-stubs/repository/_Gtk4.pyi

@@ -33457,7 +33457,9 @@ class Widget(GObject.InitiallyUnowned, Accessible, Buildable, ConstraintTarget):
     def get_allocated_width(self) -> int: ...
     def get_allocation(self) -> Gdk.Rectangle: ...
     # override
-    def get_ancestor(self, widget_type: WidgetT) -> typing.Optional[WidgetT]: ...
+    def get_ancestor(
+        self, widget_type: typing.Type[WidgetT]
+    ) -> typing.Optional[WidgetT]: ...
     def get_baseline(self) -> int: ...
     def get_can_focus(self) -> bool: ...
     def get_can_target(self) -> bool: ...