chore(deps): bump sigstore/scaffolding (kyverno#8834)

Bumps [sigstore/scaffolding](https://github.com/sigstore/scaffolding) from 9eb31e2f96b290a7c13ef653767c60dd4bc1f481 to 838c26c783a08cf497dfff29d95ca90c6eeba3df.
- [Release notes](https://github.com/sigstore/scaffolding/releases)
- [Changelog](https://github.com/sigstore/scaffolding/blob/main/release.md)
- [Commits](sigstore/scaffolding@9eb31e2...838c26c)

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

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

.github/workflows/conformance.yaml

@@ -667,7 +667,7 @@ jobs:
         uses: ./.github/actions/setup-build-env
         timeout-minutes: 10
       - name: Create kind cluster and setup Sigstore Scaffolding
-        uses: sigstore/scaffolding/actions/setup@9eb31e2f96b290a7c13ef653767c60dd4bc1f481
+        uses: sigstore/scaffolding/actions/setup@838c26c783a08cf497dfff29d95ca90c6eeba3df
         with:
           version: 'v0.6.8'
           k8s-version: ${{ matrix.k8s-version.version }}