chore(deps): bump sigstore/scaffolding (#8980)

Bumps [sigstore/scaffolding](https://github.com/sigstore/scaffolding) from 5683815091d32e0148a02d5e1146d4e7c3a6f112 to 2ac99cde6d6b55fae443d1771304d9a3957d1713.
- [Release notes](https://github.com/sigstore/scaffolding/releases)
- [Changelog](https://github.com/sigstore/scaffolding/blob/main/release.md)
- [Commits](5683815091...2ac99cde6d)

---
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>
Co-authored-by: Charles-Edouard Brétéché <charles.edouard@nirmata.com>

.github/workflows/conformance.yaml

@@ -882,7 +882,7 @@ jobs:
         uses: ./.github/actions/setup-build-env
         timeout-minutes: 10
       - name: Create kind cluster and setup Sigstore Scaffolding
-        uses: sigstore/scaffolding/actions/setup@5683815091d32e0148a02d5e1146d4e7c3a6f112
+        uses: sigstore/scaffolding/actions/setup@2ac99cde6d6b55fae443d1771304d9a3957d1713
         with:
           version: 'v0.6.8'
           k8s-version: ${{ matrix.k8s-version.version }}