Bump actions/attest-build-provenance from 2.1.0 to 2.2.1

Bumps [actions/attest-build-provenance](https://github.com/actions/attest-build-provenance) from 2.1.0 to 2.2.1.
- [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@7668571...f9eaf23)

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

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

Author: dependabot[bot]

Diff for: .github/workflows/release.yml

@@ -39,10 +39,10 @@ jobs:
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
       - name: "Sign .tar.gz"
-        uses: actions/attest-build-provenance@7668571508540a607bdfd90a87a560489fe372eb # v2.1.0
+        uses: actions/attest-build-provenance@f9eaf234fc1c2e333c1eca18177db0f44fa6ba52 # v2.2.1
         with:
           subject-path: "dist/*.tar.gz"
       - name: "Sign .deb"
-        uses: actions/attest-build-provenance@7668571508540a607bdfd90a87a560489fe372eb # v2.1.0
+        uses: actions/attest-build-provenance@f9eaf234fc1c2e333c1eca18177db0f44fa6ba52 # v2.2.1
         with:
           subject-path: "dist/*.deb"