chore(deps): bump actions/cache in /.github/actions/bootstrap (#5035)

Bumps [actions/cache](https://github.com/actions/cache) from 5.0.5 to 6.1.0.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](27d5ce7f10...55cc834586)

---
updated-dependencies:
- dependency-name: actions/cache
  dependency-version: 6.1.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/actions/bootstrap/action.yaml

@@ -60,7 +60,7 @@ runs:
     # ORAS cache: restore + save on the default branch of the canonical repo only.
     - name: Restore and save ORAS cache from github actions
       if: ${{ inputs.download-test-fixture-cache == 'true' && github.ref == format('refs/heads/{0}', github.event.repository.default_branch) && github.event.repository.fork == false }}
-      uses: actions/cache@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5.0.5
+      uses: actions/cache@55cc8345863c7cc4c66a329aec7e433d2d1c52a9 # v6.1.0
       with:
         path: ${{ github.workspace }}/.tmp/oras-cache
         key: ${{ inputs.cache-key-prefix }}-oras-cache