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>

flutter_maps_firestore/lib/main.dart

@@ -74,26 +74,25 @@ class _HomePageState extends State<HomePage> {
       body: StreamBuilder<QuerySnapshot>(
         stream: _iceCreamStores,
         builder: (context, snapshot) {
-          if (snapshot.hasError) {
-            return Center(child: Text('Error: ${snapshot.error}'));
-          }
-          if (!snapshot.hasData) {
-            return const Center(child: Text('Loading...'));
-          }
-
-          return Stack(
-            children: [
-              StoreMap(
-                documents: snapshot.data!.docs,
-                initialPosition: initialPosition,
-                mapController: _mapController,
-              ),
-              StoreCarousel(
-                mapController: _mapController,
-                documents: snapshot.data!.docs,
-              ),
-            ],
-          );
+          return switch (snapshot) {
+            AsyncSnapshot(hasError: true) =>
+              Center(child: Text('Error: ${snapshot.error}')),
+            AsyncSnapshot(hasData: false) =>
+              const Center(child: Text('Loading...')),
+            _ => Stack(
+                children: [
+                  StoreMap(
+                    documents: snapshot.data!.docs,
+                    initialPosition: initialPosition,
+                    mapController: _mapController,
+                  ),
+                  StoreCarousel(
+                    mapController: _mapController,
+                    documents: snapshot.data!.docs,
+                  ),
+                ],
+              )
+          };
         },
       ),
     );