Bump dart-lang/setup-dart from 1.6.5 to 1.7.0

Bumps [dart-lang/setup-dart](https://github.com/dart-lang/setup-dart) from 1.6.5 to 1.7.0.
- [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@0a8a0fc...e630b99)

---
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]>

Author: dependabot[bot]

.github/workflows/issue-triage.yml

@@ -25,7 +25,7 @@ jobs:
         with:
           repository: dart-lang/ecosystem
 
-      - uses: dart-lang/setup-dart@0a8a0fc875eb934c15d08629302413c671d3f672
+      - uses: dart-lang/setup-dart@e630b99d28a3b71860378cafdc2a067c71107f94
 
       - run: dart pub get
         working-directory: pkgs/sdk_triage_bot