chore(deps): bump sigstore/cosign-installer from 3.5.0 to 3.6.0 (#76)

Bumps [sigstore/cosign-installer](https://github.com/sigstore/cosign-installer) from 3.5.0 to 3.6.0.
- [Release notes](https://github.com/sigstore/cosign-installer/releases)
- [Commits](sigstore/cosign-installer@v3.5.0...v3.6.0)

---
updated-dependencies:
- dependency-name: sigstore/cosign-installer
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

.github/workflows/build-boxkit.yml

@@ -84,7 +84,7 @@ jobs:
           password: ${{ secrets.GITHUB_TOKEN }}
 
       # Sign container
-      - uses: sigstore/cosign-installer@v3.5.0
+      - uses: sigstore/cosign-installer@v3.6.0
 
       - name: Sign container image
         if: github.event_name != 'pull_request'