chore(deps): bump sigstore/scaffolding (#8730)

Bumps [sigstore/scaffolding](https://github.com/sigstore/scaffolding) from d120ad89e1f5c9d4a0bbd92959c6874be2a2131d to ef44f1a1b8bb27040426d3e0538236df2c3deaa7.
- [Release notes](https://github.com/sigstore/scaffolding/releases)
- [Changelog](https://github.com/sigstore/scaffolding/blob/main/release.md)
- [Commits](d120ad89e1...ef44f1a1b8)

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

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Signed-off-by: shuting <shuting@nirmata.com>
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Co-authored-by: shuting <shuting@nirmata.com>

.github/workflows/conformance.yaml

@@ -574,7 +574,7 @@ jobs:
         uses: ./.github/actions/setup-build-env
         timeout-minutes: 10
       - name: Create kind cluster and setup Sigstore Scaffolding
-        uses: sigstore/scaffolding/actions/setup@d120ad89e1f5c9d4a0bbd92959c6874be2a2131d
+        uses: sigstore/scaffolding/actions/setup@ef44f1a1b8bb27040426d3e0538236df2c3deaa7
         with:
           version: 'v0.6.8'
           k8s-version: ${{ matrix.k8s-version.version }}