Bump actions/attest-build-provenance from 3 to 4 (#356)

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](actions/attest-build-provenance@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>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/repro.yml

@@ -23,7 +23,7 @@ jobs:
       shell: bash
       run: .github/workflows/repro.sh
 
-    - uses: actions/attest-build-provenance@v3
+    - uses: actions/attest-build-provenance@v4
       if: matrix.os == 'ubuntu-latest'
       with:
         subject-path: |