build(deps): bump slsa-framework/slsa-github-generator (#265)

Bumps [slsa-framework/slsa-github-generator](https://github.com/slsa-framework/slsa-github-generator) from 1.9.0 to 1.9.1.
- [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@v1.9.0...v1.9.1)

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

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

.github/workflows/java-build-for-release.yml

@@ -81,7 +81,7 @@ jobs:
       actions: read # To read the workflow path.
       id-token: write # To sign the provenance.
       contents: write
-    uses: slsa-framework/slsa-github-generator/.github/workflows/generator_generic_slsa3.yml@v1.9.0
+    uses: slsa-framework/slsa-github-generator/.github/workflows/generator_generic_slsa3.yml@v1.9.1
     with:
       attestation-name: "protobuf-specs-${{ needs.strip-tag.outputs.version }}.attestation.intoto.jsonl"
       upload-assets: true