Bump dart-lang/setup-dart in the github-actions group (#4278)

Bumps the github-actions group with 1 update: [dart-lang/setup-dart](https://github.com/dart-lang/setup-dart).


Updates `dart-lang/setup-dart` from 1.7.0 to 1.7.1
- [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@e630b99...e51d8e5)

---
updated-dependencies:
- dependency-name: dart-lang/setup-dart
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: github-actions
...

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

Author: dependabot[bot]

.github/workflows/dart.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
-      - uses: dart-lang/setup-dart@e630b99d28a3b71860378cafdc2a067c71107f94
+      - uses: dart-lang/setup-dart@e51d8e571e22473a2ddebf0ef8a2123f0ab2c02c
         with:
             sdk: main
       - name: dart pub get (specification)
@@ -36,7 +36,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
-      - uses: dart-lang/setup-dart@e630b99d28a3b71860378cafdc2a067c71107f94
+      - uses: dart-lang/setup-dart@e51d8e571e22473a2ddebf0ef8a2123f0ab2c02c
         with:
             sdk: main
       - name: dart pub get (accepted/future-releases/0546-patterns/exhaustiveness_prototype)