Bump dart-lang/setup-dart from 1.5.1 to 1.6.0 (#140)

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](dart-lang/setup-dart@8a4b97e...b64355a)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/dart.yml

@@ -29,7 +29,7 @@ jobs:
             os:ubuntu-latest;pub-cache-hosted
             os:ubuntu-latest
       - name: Setup Dart SDK
-        uses: dart-lang/setup-dart@8a4b97ea2017cc079571daec46542f76189836b1
+        uses: dart-lang/setup-dart@b64355ae6ca0b5d484f0106a033dd1388965d06d
         with:
           sdk: stable
       - id: checkout
@@ -54,7 +54,7 @@ jobs:
             os:ubuntu-latest;pub-cache-hosted
             os:ubuntu-latest
       - name: Setup Dart SDK
-        uses: dart-lang/setup-dart@8a4b97ea2017cc079571daec46542f76189836b1
+        uses: dart-lang/setup-dart@b64355ae6ca0b5d484f0106a033dd1388965d06d
         with:
           sdk: "3.0.0"
       - id: checkout
@@ -95,7 +95,7 @@ jobs:
             os:ubuntu-latest;pub-cache-hosted
             os:ubuntu-latest
       - name: Setup Dart SDK
-        uses: dart-lang/setup-dart@8a4b97ea2017cc079571daec46542f76189836b1
+        uses: dart-lang/setup-dart@b64355ae6ca0b5d484f0106a033dd1388965d06d
         with:
           sdk: "3.0.0"
       - id: checkout
@@ -136,7 +136,7 @@ jobs:
             os:ubuntu-latest;pub-cache-hosted
             os:ubuntu-latest
       - name: Setup Dart SDK
-        uses: dart-lang/setup-dart@8a4b97ea2017cc079571daec46542f76189836b1
+        uses: dart-lang/setup-dart@b64355ae6ca0b5d484f0106a033dd1388965d06d
         with:
           sdk: dev
       - id: checkout
@@ -177,7 +177,7 @@ jobs:
             os:ubuntu-latest;pub-cache-hosted
             os:ubuntu-latest
       - name: Setup Dart SDK
-        uses: dart-lang/setup-dart@8a4b97ea2017cc079571daec46542f76189836b1
+        uses: dart-lang/setup-dart@b64355ae6ca0b5d484f0106a033dd1388965d06d
         with:
           sdk: dev
       - id: checkout
@@ -218,7 +218,7 @@ jobs:
             os:ubuntu-latest;pub-cache-hosted
             os:ubuntu-latest
       - name: Setup Dart SDK
-        uses: dart-lang/setup-dart@8a4b97ea2017cc079571daec46542f76189836b1
+        uses: dart-lang/setup-dart@b64355ae6ca0b5d484f0106a033dd1388965d06d
         with:
           sdk: "3.0.0"
       - id: checkout
@@ -254,7 +254,7 @@ jobs:
             os:ubuntu-latest;pub-cache-hosted
             os:ubuntu-latest
       - name: Setup Dart SDK
-        uses: dart-lang/setup-dart@8a4b97ea2017cc079571daec46542f76189836b1
+        uses: dart-lang/setup-dart@b64355ae6ca0b5d484f0106a033dd1388965d06d
         with:
           sdk: dev
       - id: checkout