fix test

Author: chunhtai

packages/go_router/test/extension_test.dart

@@ -38,9 +38,7 @@ void main() {
       final GoRouter router = await createGoRouter(tester);
       await tester.tap(find.text('Settings'));
       await tester.pumpAndSettle();
-      final ImperativeRouteMatch routeMatch = router
-          .routerDelegate.currentConfiguration.last as ImperativeRouteMatch;
-      expect(routeMatch.matches.uri.toString(),
+      expect(router.routerDelegate.currentConfiguration.uri.toString(),
           '/page-0/settings?search=notification');
     });
   });