Bump actions/attest-build-provenance in the github-actions group (#99)

Bumps the github-actions group with 1 update: [actions/attest-build-provenance](https://github.com/actions/attest-build-provenance).


Updates `actions/attest-build-provenance` from 2.3.0 to 2.4.0
- [Release notes](https://github.com/actions/attest-build-provenance/releases)
- [Changelog](https://github.com/actions/attest-build-provenance/blob/main/RELEASE.md)
- [Commits](actions/attest-build-provenance@db473fd...e8998f9)

Author: dependabot[bot]

.github/workflows/release.yml

@@ -55,7 +55,7 @@ jobs:
         labels: ${{ steps.docker-meta.outputs.labels }}
 
     - name: Attest image
-      uses: actions/attest-build-provenance@db473fddc028af60658334401dc6fa3ffd8669fd  # v2.3.0
+      uses: actions/attest-build-provenance@e8998f949152b193b063cb0ec769d69d929409be  # v2.4.0
       with:
         subject-name: index.docker.io/${{ env.DOCKER_IMAGE_NAME }}
         subject-digest: ${{ steps.docker-push.outputs.digest }}