Bumps the ci group with 2 updates: [actions/checkout](https://github.com/actions/checkout) and [slsa-framework/slsa-github-generator](https://github.com/slsa-framework/slsa-github-generator).

Updates `actions/checkout` from 3.5.3 to 3.6.0
- [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/c85c95e3d7251135ab7dc9ce3241c5835cc595a9...f43a0e5ff2bd294095638e18286ca9a3d1956744)

Updates `slsa-framework/slsa-github-generator` from 1.8.0 to 1.9.0
- [Release notes](https://github.com/slsa-framework/slsa-github-generator/releases)
- [Changelog](https://github.com/slsa-framework/slsa-github-generator/blob/main/CHANGELOG.md)
- [Commits](https://github.com/slsa-framework/slsa-github-generator/compare/v1.8.0...v1.9.0

)

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

Signed-off-by: dependabot[bot] <support@github.com>
(cherry picked from commit 29f77d2c)