build(deps): bump actions/attest-build-provenance from 2.3.0 to 2.4.0 (#421)

Bumps [actions/attest-build-provenance](https://github.com/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)

---
updated-dependencies:
- dependency-name: actions/attest-build-provenance
  dependency-version: 2.4.0
  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/publish.yml

@@ -79,7 +79,7 @@ jobs:
             --data-binary @${_filename} \
             https://uploads.github.com/repos/${{ github.repository_owner }}/cardano-node-api/releases/${{ needs.create-draft-release.outputs.RELEASE_ID }}/assets?name=${_filename}
       - name: Attest binary
-        uses: actions/attest-build-provenance@db473fddc028af60658334401dc6fa3ffd8669fd # v2.3.0 https://github.com/actions/attest-build-provenance/releases/tag/v2.3.0
+        uses: actions/attest-build-provenance@e8998f949152b193b063cb0ec769d69d929409be # v2.4.0 https://github.com/actions/attest-build-provenance/releases/tag/v2.4.0
         with:
           subject-path: 'cardano-node-api'
 
@@ -136,13 +136,13 @@ jobs:
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
       - name: Attest Docker Hub image
-        uses: actions/attest-build-provenance@db473fddc028af60658334401dc6fa3ffd8669fd # v2.3.0 https://github.com/actions/attest-build-provenance/releases/tag/v2.3.0
+        uses: actions/attest-build-provenance@e8998f949152b193b063cb0ec769d69d929409be # v2.4.0 https://github.com/actions/attest-build-provenance/releases/tag/v2.4.0
         with:
           subject-name: index.docker.io/blinklabs/cardano-node-api
           subject-digest: ${{ steps.push.outputs.digest }}
           push-to-registry: true
       - name: Attest GHCR image
-        uses: actions/attest-build-provenance@db473fddc028af60658334401dc6fa3ffd8669fd # v2.3.0 https://github.com/actions/attest-build-provenance/releases/tag/v2.3.0
+        uses: actions/attest-build-provenance@e8998f949152b193b063cb0ec769d69d929409be # v2.4.0 https://github.com/actions/attest-build-provenance/releases/tag/v2.4.0
         with:
           subject-name: ghcr.io/${{ github.repository }}
           subject-digest: ${{ steps.push.outputs.digest }}