Bump actions/attest-build-provenance from 1 to 2

Bumps [actions/attest-build-provenance](https://github.com/actions/attest-build-provenance) from 1 to 2.
- [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@v1...v2)

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

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

.github/workflows/release.yml

@@ -40,6 +40,6 @@ jobs:
       - name: Write outputs
         id: publications
         run: ./gradlew :writePublicationsToGitHubOutput -Pversion=$version
-      - uses: actions/attest-build-provenance@v1
+      - uses: actions/attest-build-provenance@v2
         with:
           subject-path: ${{ steps.publications.outputs.publishedFiles }}