build(deps): bump dart-lang/setup-dart from 1.5.0 to 1.6.0 (#443)

Bumps [dart-lang/setup-dart](https://github.com/dart-lang/setup-dart) from 1.5.0 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](dart-lang/setup-dart@d6a63da...b64355a) --- updated-dependencies: - dependency-name: dart-lang/setup-dart dependency-type: direct:production update-type: version-update:semver-minor ... Signed-off-by: dependabot[bot] <support@github.com> Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/conformance.yml

@@ -30,7 +30,7 @@ jobs:
  with:
  go-version: '^1.16'
 
- - uses: dart-lang/setup-dart@d6a63dab3335f427404425de0fbfed4686d93c4f
+ - uses: dart-lang/setup-dart@b64355ae6ca0b5d484f0106a033dd1388965d06d
  with:
  sdk: stable
  - run: dart --version