🌱 Bump slsa-framework/slsa-github-generator from 1.6.0 to 1.9.0

Bumps [slsa-framework/slsa-github-generator](https://github.com/slsa-framework/slsa-github-generator) from 1.6.0 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](slsa-framework/slsa-github-generator@v1.6.0...v1.9.0)

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

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

.github/workflows/publishimage.yml

@@ -51,7 +51,7 @@ jobs:
       id-token: write # for creating OIDC tokens for signing.
       packages: write # for uploading attestations.
     if: startsWith(github.ref, 'refs/tags/')
-    uses: slsa-framework/slsa-github-generator/.github/workflows/generator_container_slsa3.yml@v1.6.0
+    uses: slsa-framework/slsa-github-generator/.github/workflows/generator_container_slsa3.yml@v1.9.0
     with:
       image: ${{ needs.build.outputs.image }}
       digest: ${{ needs.build.outputs.digest }}