Bumps [actions/checkout](https://github.com/actions/checkout) from 6.0.2 to 6.0.3.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](
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| .. | ||
| buildifier.yaml | ||
| ci.yml | ||
| github-actions-are-differences-found.yml | ||
| on-delete.yml | ||
| on-label.yml | ||
| on-push.yml | ||
| sync-from-upstream.yml | ||