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/build-phar.yml

@@ -54,7 +54,7 @@ jobs:
         # code, which would store attestation that `php/pie` built the PHAR, and
         # it would look genuine. So this should NOT run for PR builds.
         if: github.event_name != 'pull_request'
-        uses: actions/attest-build-provenance@v1
+        uses: actions/attest-build-provenance@v2
         with:
           subject-path: '${{ github.workspace }}/pie.phar'
       - uses: actions/upload-artifact@v4

.github/workflows/release.yml

@@ -107,7 +107,7 @@ jobs:
           labels: ${{ steps.meta.outputs.labels }}
 
       - name: Generate artifact attestation
-        uses: actions/attest-build-provenance@v1
+        uses: actions/attest-build-provenance@v2
         with:
           subject-name: ghcr.io/${{ github.repository }}
           subject-digest: ${{ steps.build-and-push.outputs.digest }}