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
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
diff --git a/pkgs/test_process/.github/workflows/test-package.yml b/pkgs/test_process/.github/workflows/test-package.yml
index 872aa0b..bfc4875 100644
--- a/pkgs/test_process/.github/workflows/test-package.yml
+++ b/pkgs/test_process/.github/workflows/test-package.yml
@@ -23,7 +23,7 @@
         sdk: [dev]
     steps:
       - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11
-      - uses: dart-lang/setup-dart@8a4b97ea2017cc079571daec46542f76189836b1
+      - uses: dart-lang/setup-dart@b64355ae6ca0b5d484f0106a033dd1388965d06d
         with:
           sdk: ${{ matrix.sdk }}
       - id: install
@@ -50,7 +50,7 @@
         sdk: [2.17.0, dev]
     steps:
       - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11
-      - uses: dart-lang/setup-dart@8a4b97ea2017cc079571daec46542f76189836b1
+      - uses: dart-lang/setup-dart@b64355ae6ca0b5d484f0106a033dd1388965d06d
         with:
           sdk: ${{ matrix.sdk }}
       - id: install