CI: Bump actions/checkout in the github-actions group across 1 directory

CI: Bump actions/checkout in the github-actions group across 1 directory

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

Updates `actions/checkout` from 6 to 6.0.2
- [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/v6...v6.0.2)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: 6.0.2
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: github-actions
...

Signed-off-by: dependabot[bot] <support@github.com>