Update beta and main pub dependencies

[parlough]

This PR pins dart_flutter_team_lints for now, as it results in an inclusion error as the SDK constraint is not yet ^3.7.

[github-actions]

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// Copyright (c) 2025, the Dart project authors. Please see the AUTHORS file
// 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.

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pkgs/samples/lib/brick_breaker.dart
pkgs/samples/lib/fibonacci.dart
pkgs/samples/lib/google_ai.dart
pkgs/samples/lib/hello_world.dart
pkgs/samples/lib/main.dart
pkgs/samples/lib/sunflower.dart

[devoncarew]

lgtm w/ two notes for backing out the pinning once the next stable sdk is out

[johnpryan]

Thanks @parlough!