Bump actions/checkout from 4.1.7 to 4.2.0 in the github-actions group (dart-lang/sse#116)

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


Updates `actions/checkout` from 4.1.7 to 4.2.0
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](https://github.com/actions/checkout/compare/692973e3d937129bcbf40652eb9f2f61becf3332...d632683dd7b4114ad314bca15554477dd762a938)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: github-actions
...

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