Bump slsa-framework/slsa-github-generator from 2.0.0 to 2.1.0 (#480)

Bumps [slsa-framework/slsa-github-generator](https://github.com/slsa-framework/slsa-github-generator) from 2.0.0 to 2.1.0.
- [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@v2.0.0...v2.1.0)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/image.yaml

@@ -110,7 +110,7 @@ jobs:
       packages: write   # To upload assets to release.
       actions: read     # To read the workflow path.
     # NOTE: The container generator workflow is not officially released as GA.
-    uses: slsa-framework/slsa-github-generator/.github/workflows/generator_container_slsa3.yml@v2.0.0
+    uses: slsa-framework/slsa-github-generator/.github/workflows/generator_container_slsa3.yml@v2.1.0
     with:
       image: ghcr.io/${{ github.repository_owner }}/policy-reporter-ui
       digest: "${{ needs.publish-images.outputs.digest }}"