Update Samples for 3.16 (#2085)

*Replace this paragraph with a description of what this PR is changing
or adding, and why. Consider including before/after screenshots.*

*List which issues are fixed by this PR. For larger changes, raising an
issue first helps
reduce redundant work.*

## Pre-launch Checklist

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

If you need help, consider asking for advice on the #hackers-devrel
channel on [Discord].

<!-- Links -->
[Flutter Style Guide]:
https://github.com/flutter/flutter/wiki/Style-guide-for-Flutter-repo
[CLA]: https://cla.developers.google.com/
[Discord]: https://github.com/flutter/flutter/wiki/Chat
[Contributors Guide]:
https://github.com/flutter/samples/blob/main/CONTRIBUTING.md

experimental/web_dashboard/lib/src/widgets/category_chart.dart

@@ -2,7 +2,8 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-import 'package:charts_flutter/flutter.dart' as charts;
+import 'package:community_charts_flutter/community_charts_flutter.dart'
+    as charts;
 import 'package:flutter/material.dart';
 import 'package:intl/intl.dart' as intl;
 

experimental/web_dashboard/pubspec.yaml

@@ -7,16 +7,16 @@ environment:
   sdk: ^3.1.0
 
 dependencies:
-  charts_flutter: ^0.12.0
   cloud_firestore: ^4.0.1
   collection: ^1.16.0
+  community_charts_flutter: ^1.0.2
   cupertino_icons: ^1.0.0
   firebase_auth: ^4.0.1
   firebase_core: ^2.0.0
   flutter:
     sdk: flutter
   google_sign_in: ^6.0.0
-  intl: ^0.17.0
+  intl: any # Pinned by Flutter SDK version
   json_annotation: ^4.5.0
   path: ^1.8.1
   provider: ^6.0.0