build(deps): bump slsa-framework/slsa-github-generator (#727)

Bumps [slsa-framework/slsa-github-generator](https://github.com/slsa-framework/slsa-github-generator) from 1.7.0 to 1.8.0.
- [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@v1.7.0...v1.8.0)

---
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>

.github/workflows/release.yml

@@ -105,7 +105,7 @@ jobs:
       contents: write # To add assets to a release.
     # Currently this action needs to be referred by tag. More details at:
     # https://github.com/slsa-framework/slsa-github-generator#verification-of-provenance
-    uses: slsa-framework/slsa-github-generator/.github/workflows/generator_generic_slsa3.yml@v1.7.0
+    uses: slsa-framework/slsa-github-generator/.github/workflows/generator_generic_slsa3.yml@v1.8.0
     with:
       attestation-name: provenance-sigstore-${{ github.event.release.tag_name }}.intoto.jsonl
       base64-subjects: "${{ needs.build.outputs.hashes }}"