Bump dart-lang/setup-dart from 1.5.1 to 1.6.0 (dart-lang/test_process#51)

Bumps [dart-lang/setup-dart](https://github.com/dart-lang/setup-dart) from 1.5.1 to 1.6.0.
- [Release notes](https://github.com/dart-lang/setup-dart/releases)
- [Changelog](https://github.com/dart-lang/setup-dart/blob/main/CHANGELOG.md)
- [Commits](https://github.com/dart-lang/setup-dart/compare/8a4b97ea2017cc079571daec46542f76189836b1...b64355ae6ca0b5d484f0106a033dd1388965d06d)

---
updated-dependencies:
- dependency-name: dart-lang/setup-dart
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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1 file changed
tree: e268b3b6cbe40f3cda0c5daffc5ca607a312c500
  1. pkgs/