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

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>

.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

.github/workflows/lint.yml

@@ -28,7 +28,7 @@ jobs:
             os:ubuntu-latest;pub-cache-hosted
             os:ubuntu-latest
       - name: Setup Dart SDK
-        uses: dart-lang/setup-dart@d6a63dab3335f427404425de0fbfed4686d93c4f
+        uses: dart-lang/setup-dart@b64355ae6ca0b5d484f0106a033dd1388965d06d
         with:
           sdk: stable
       - id: checkout
@@ -53,7 +53,7 @@ jobs:
             os:ubuntu-latest;pub-cache-hosted
             os:ubuntu-latest
       - name: Setup Dart SDK
-        uses: dart-lang/setup-dart@d6a63dab3335f427404425de0fbfed4686d93c4f
+        uses: dart-lang/setup-dart@b64355ae6ca0b5d484f0106a033dd1388965d06d
         with:
           sdk: "3.0.0"
       - id: checkout
@@ -191,7 +191,7 @@ jobs:
             os:ubuntu-latest;pub-cache-hosted
             os:ubuntu-latest
       - name: Setup Dart SDK
-        uses: dart-lang/setup-dart@d6a63dab3335f427404425de0fbfed4686d93c4f
+        uses: dart-lang/setup-dart@b64355ae6ca0b5d484f0106a033dd1388965d06d
         with:
           sdk: dev
       - id: checkout
@@ -394,7 +394,7 @@ jobs:
             os:ubuntu-latest;pub-cache-hosted
             os:ubuntu-latest
       - name: Setup Dart SDK
-        uses: dart-lang/setup-dart@d6a63dab3335f427404425de0fbfed4686d93c4f
+        uses: dart-lang/setup-dart@b64355ae6ca0b5d484f0106a033dd1388965d06d
         with:
           sdk: dev
       - id: checkout

.github/workflows/unit.yml

@@ -30,7 +30,7 @@ jobs:
             os:ubuntu-latest;pub-cache-hosted
             os:ubuntu-latest
       - name: Setup Dart SDK
-        uses: dart-lang/setup-dart@d6a63dab3335f427404425de0fbfed4686d93c4f
+        uses: dart-lang/setup-dart@b64355ae6ca0b5d484f0106a033dd1388965d06d
         with:
           sdk: "3.0.0"
       - id: checkout
@@ -87,7 +87,7 @@ jobs:
             os:ubuntu-latest;pub-cache-hosted
             os:ubuntu-latest
       - name: Setup Dart SDK
-        uses: dart-lang/setup-dart@d6a63dab3335f427404425de0fbfed4686d93c4f
+        uses: dart-lang/setup-dart@b64355ae6ca0b5d484f0106a033dd1388965d06d
         with:
           sdk: "3.0.0"
       - id: checkout
@@ -117,7 +117,7 @@ jobs:
             os:ubuntu-latest;pub-cache-hosted
             os:ubuntu-latest
       - name: Setup Dart SDK
-        uses: dart-lang/setup-dart@d6a63dab3335f427404425de0fbfed4686d93c4f
+        uses: dart-lang/setup-dart@b64355ae6ca0b5d484f0106a033dd1388965d06d
         with:
           sdk: dev
       - id: checkout
@@ -246,7 +246,7 @@ jobs:
             os:ubuntu-latest;pub-cache-hosted
             os:ubuntu-latest
       - name: Setup Dart SDK
-        uses: dart-lang/setup-dart@d6a63dab3335f427404425de0fbfed4686d93c4f
+        uses: dart-lang/setup-dart@b64355ae6ca0b5d484f0106a033dd1388965d06d
         with:
           sdk: dev
       - id: checkout
@@ -294,7 +294,7 @@ jobs:
             os:macos-latest;pub-cache-hosted
             os:macos-latest
       - name: Setup Dart SDK
-        uses: dart-lang/setup-dart@d6a63dab3335f427404425de0fbfed4686d93c4f
+        uses: dart-lang/setup-dart@b64355ae6ca0b5d484f0106a033dd1388965d06d
         with:
           sdk: "3.0.0"
       - id: checkout
@@ -324,7 +324,7 @@ jobs:
             os:macos-latest;pub-cache-hosted
             os:macos-latest
       - name: Setup Dart SDK
-        uses: dart-lang/setup-dart@d6a63dab3335f427404425de0fbfed4686d93c4f
+        uses: dart-lang/setup-dart@b64355ae6ca0b5d484f0106a033dd1388965d06d
         with:
           sdk: dev
       - id: checkout
@@ -344,7 +344,7 @@ jobs:
     runs-on: windows-latest
     steps:
       - name: Setup Dart SDK
-        uses: dart-lang/setup-dart@d6a63dab3335f427404425de0fbfed4686d93c4f
+        uses: dart-lang/setup-dart@b64355ae6ca0b5d484f0106a033dd1388965d06d
         with:
           sdk: dev
       - id: checkout