Dart: Breaking change: Improved Directives Sorting Analysis

[NewsBot]

A new Dart blog post/announcement has been posted!

As of the 2.14.0-52.0.dev build and 2.14 stable, the directives_ordering lint will catch a number of previously overlooked cases. Some work was done to update Flutter and patch up downstream packages (see: dart-lang/linter#2609) but other consumers of this lint may see new violations. The lint

Get the full details here: https://groups.google.com/a/dartlang.org/d/msg/announce/fBD8eH6SLvs/L4nM9-WqDQAJ