Bump actions/attest-build-provenance from 2.2.3 to 2.3.0

Bumps [actions/attest-build-provenance](https://github.com/actions/attest-build-provenance) from 2.2.3 to 2.3.0.
- [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@c074443...db473fd)

---
updated-dependencies:
- dependency-name: actions/attest-build-provenance
  dependency-version: 2.3.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

.github/workflows/release.yml

@@ -39,7 +39,7 @@ jobs:
       - name: build
         run: echo "GEM_VERSION=$(gem build ${{ env.GEM_NAME }}.gemspec 2>&1 | grep Version | cut -d':' -f 2 | tr -d " \t\n\r")" >> $GITHUB_ENV
 
-      - uses: actions/attest-build-provenance@c074443f1aee8d4aeeae555aebba3282517141b2 # pin@v2
+      - uses: actions/attest-build-provenance@db473fddc028af60658334401dc6fa3ffd8669fd # pin@v2
         with:
           subject-path: "${{ env.GEM_NAME }}-${{ env.GEM_VERSION }}.gem"