Bump actions/attest-build-provenance from 3 to 4

Bumps [actions/attest-build-provenance](https://github.com/actions/attest-build-provenance) from 3 to 4.
- [Release notes](https://github.com/actions/attest-build-provenance/releases)
- [Changelog](https://github.com/actions/attest-build-provenance/blob/main/RELEASE.md)
- [Commits](https://github.com/actions/attest-build-provenance/compare/v3...v4)

---
updated-dependencies:
- dependency-name: actions/attest-build-provenance
  dependency-version: '4'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/ci.yml

@@ -88,14 +88,14 @@ jobs:
           cosign sign --yes $(jq --arg DOCKERHUB_DIGEST_SHA "$(cat DOCKERHUB_DIGEST_SHA)" -cr '.target."docker-metadata-action".tags | map(select(startswith("index.docker.io/${{github.repository}}")) | . + "@" + $DOCKERHUB_DIGEST_SHA) | join(" ")' ${{ runner.temp }}/${{matrix.variant}}/bake-meta.json)
 
       - name: Attest GHCR
-        uses: actions/attest-build-provenance@v3
+        uses: actions/attest-build-provenance@v4
         with:
           subject-name: ghcr.io/${{github.repository}}
           subject-digest: ${{ env.GHCR_DIGEST_SHA }}
           push-to-registry: true
 
       - name: Attest Dockerhub
-        uses: actions/attest-build-provenance@v3
+        uses: actions/attest-build-provenance@v4
         with:
           subject-name: index.docker.io/${{github.repository}}
           subject-digest: ${{ env.DOCKERHUB_DIGEST_SHA }}
@@ -414,7 +414,7 @@ jobs:
 
       - name: Attest binary
         id: attest
-        uses: actions/attest-build-provenance@v3
+        uses: actions/attest-build-provenance@v4
         with:
           subject-path: |
             archive/**/*.tar.gz