chore(deps): bump sigstore/scaffolding (#8935)

Bumps [sigstore/scaffolding](https://github.com/sigstore/scaffolding) from 55c9f48de0c1c77f08b1d14a8c340195599982f6 to 126e381beb1580df23067f9f49854293d04895ee.
- [Release notes](https://github.com/sigstore/scaffolding/releases)
- [Changelog](https://github.com/sigstore/scaffolding/blob/main/release.md)
- [Commits](55c9f48de0...126e381beb)

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

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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@55c9f48de0c1c77f08b1d14a8c340195599982f6
+        uses: sigstore/scaffolding/actions/setup@126e381beb1580df23067f9f49854293d04895ee
         with:
           version: 'v0.6.8'
           k8s-version: ${{ matrix.k8s-version.version }}