chore(deps): bump sigstore/scaffolding (kyverno#9409)

Bumps [sigstore/scaffolding](https://github.com/sigstore/scaffolding) from 139e608e4f511e6e25364511abe522673eb2d38e to bc13121659512e76af239502fad1249fd4a4db9e.
- [Release notes](https://github.com/sigstore/scaffolding/releases)
- [Changelog](https://github.com/sigstore/scaffolding/blob/main/release.md)
- [Commits](sigstore/scaffolding@139e608...bc13121)

---
updated-dependencies:
- dependency-name: sigstore/scaffolding
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>
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@56be3cb4ec65a987b6ef4d7ab3a55ee17760a57c # v0.1.2
       # create cluster
       - name: Create kind cluster and setup Sigstore Scaffolding
-        uses: sigstore/scaffolding/actions/setup@139e608e4f511e6e25364511abe522673eb2d38e
+        uses: sigstore/scaffolding/actions/setup@bc13121659512e76af239502fad1249fd4a4db9e
         with:
           version: main
           k8s-version: ${{ matrix.k8s-version.version }}