This is a tracking issue to ensure we have dependabot configs for our [dart.dev](https://pub.dev/publishers/dart.dev/packages) published packages. - [x] https://github.com/dart-lang/args/pull/226 - [x] https://github.com/dart-lang/characters/pull/67 - [x] https://github.com/dart-lang/typed_data/pull/55 - [x] https://github.com/dart-lang/crypto/pull/136 - [x] https://github.com/dart-lang/fake_async/pull/52 - [x] https://github.com/dart-lang/ffi/pull/164 - [x] https://github.com/dart-lang/path/pull/128 - [x] https://github.com/dart-lang/fixnum/pull/94 - [x] https://github.com/dart-lang/mockito/pull/584