Bump pub
Bump pub

Contains a single commit:

```
 0402c467 Recommend running `flutter pub` instead of `dart pub` when running from inside flutter. (#2842)
```

Change-Id: Icb89708a16631a99157428ac7e0d04fc29524d49
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/180569
Commit-Queue: Sigurd Meldgaard <3f12f2c0f1efe4fd67753fcd55cd7bc21e5b85cf@google.com>
Reviewed-by: Jonas Jensen <c9327fa216ae2ef84df7c55b809d4ba270141b48@google.com>

dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk