Update for Flutter 3.10 beta (#1746)

## Pre-launch Checklist

- [x] I read the [Flutter Style Guide] _recently_, and have followed its
advice.
- [x] I signed the [CLA].
- [x] I read the [Contributors Guide].
- [x] I updated/added relevant documentation (doc comments with `///`).
- [ ] All existing and new tests are passing.

---------

Co-authored-by: David Iglesias <ditman@gmail.com>
Co-authored-by: Mark Thompson <2554588+MarkTechson@users.noreply.github.com>
Co-authored-by: John Ryan <ryjohn@google.com>

deeplink_store_example/lib/product_details.dart

@@ -23,8 +23,9 @@ class ProductDetails extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    final String currentId = GoRouterState.of(context).params['id']!;
-    final Product product = ProductsRepository.loadProduct(id: int.parse(currentId));
+    final String currentId = GoRouterState.of(context).pathParameters['id']!;
+    final Product product =
+        ProductsRepository.loadProduct(id: int.parse(currentId));
     return Scaffold(
       body: ListView(
         children: <Widget>[
@@ -40,7 +41,7 @@ class ProductDetails extends StatelessWidget {
   }
 }
 
-class ProductPicture extends StatelessWidget{
+class ProductPicture extends StatelessWidget {
   const ProductPicture({super.key, required this.product});
 
   final Product product;
@@ -63,4 +64,4 @@ class ProductPicture extends StatelessWidget{
       ],
     );
   }
-}
+}