Bump slsa-framework/slsa-github-generator from 1.9.0 to 2.1.0 (#164)

Author: dependabot[bot]

.github/workflows/release.yaml

@@ -76,6 +76,6 @@ jobs:
       actions: read # Needed for detection of GitHub Actions environment.
       id-token: write # Needed for provenance signing and ID.
       contents: write # Needed for release uploads.
-    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@v2.1.0
     with:
       base64-subjects: "${{ needs.release.outputs.hashes }}"