Bump actions/attest-build-provenance from 2 to 3

Bumps [actions/attest-build-provenance](https://github.com/actions/attest-build-provenance) from 2 to 3.
- [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@v2...v3)

---
updated-dependencies:
- dependency-name: actions/attest-build-provenance
  dependency-version: '3'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/build-ffmpeg.yaml

@@ -133,7 +133,7 @@ jobs:
           
       - name: Generate artifact attestation for FFmpeg binaries
         if: '! inputs.no_release'
-        uses: actions/attest-build-provenance@v2
+        uses: actions/attest-build-provenance@v3
         with:
           subject-path: ff*.exe
 
@@ -142,7 +142,7 @@ jobs:
 
       - name: Generate artifact attestation for FFmpeg archive
         if: '! inputs.no_release'
-        uses: actions/attest-build-provenance@v2
+        uses: actions/attest-build-provenance@v3
         with:
           subject-path: ffmpeg-${{ needs.check.outputs.version }}-${{ needs.check.outputs.helper-git-sha-short }}-${{ matrix.os }}-nonfree.7z