Fixup for failing Beta CI (#2092)

Turns out, we shipped a new Flutter beta as well. 

Commenting out `experimental/varfont_shader_puzzle` from beta CI

Everything else is just cleanup.

## 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 `///`).
- [x] 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

analysis_defaults/pubspec.yaml

@@ -3,7 +3,7 @@ description: Analysis defaults for flutter/samples
 publish_to: none
 
 environment:
-  sdk: ^3.1.0
+  sdk: ^3.2.0
 
 # NOTE: Code is not allowed in this package. Do not add more dependencies.
 # The `flutter_lints` dependency is required for `lib/flutter.yaml`.