chore(deps): bump sigstore/scaffolding from 0.6.12 to 0.6.13 (#9182)

Bumps [sigstore/scaffolding](https://github.com/sigstore/scaffolding) from 0.6.12 to 0.6.13.
- [Release notes](https://github.com/sigstore/scaffolding/releases)
- [Changelog](https://github.com/sigstore/scaffolding/blob/main/release.md)
- [Commits](9e5583eaf4...a6e9b1a7a4)

---
updated-dependencies:
- dependency-name: sigstore/scaffolding
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/conformance.yaml

@@ -640,7 +640,7 @@ jobs:
         uses: kyverno/action-install-chainsaw@6ab03ccb2c8309b5f494fcbc78ec3a2d80cfabee # v0.1.0
       # create cluster
       - name: Create kind cluster and setup Sigstore Scaffolding
-        uses: sigstore/scaffolding/actions/setup@9e5583eaf47855103a9acd6eaa2b1da85f28e28e
+        uses: sigstore/scaffolding/actions/setup@a6e9b1a7a45f10449bbb677c31ce4c1389edd08b
         with:
           version: 'v0.6.8'
           k8s-version: ${{ matrix.k8s-version.version }}