chore(deps): bump actions/attest-build-provenance from 1.4.4 to 2.1.0

Bumps [actions/attest-build-provenance](https://github.com/actions/attest-build-provenance) from 1.4.4 to 2.1.0.
- [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@ef24412...7668571)

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

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

.github/workflows/release.yaml

@@ -71,11 +71,11 @@ jobs:
       env:
         ARTIFACTS: ${{steps.goreleaser.outputs.artifacts}}
     # attest archives
-    - uses: actions/attest-build-provenance@ef244123eb79f2f7a7e75d99086184180e6d0018 # v1.4.4
+    - uses: actions/attest-build-provenance@7668571508540a607bdfd90a87a560489fe372eb # v2.1.0
       with:
         subject-path: "dist/*.tar.gz"
     # attest images
-    - uses: actions/attest-build-provenance@ef244123eb79f2f7a7e75d99086184180e6d0018 # v1.4.4
+    - uses: actions/attest-build-provenance@7668571508540a607bdfd90a87a560489fe372eb # v2.1.0
       with:
         subject-digest: ${{steps.image_metadata.outputs.digest}}
         subject-name: ${{steps.image_metadata.outputs.name}}