chore(deps): bump sigstore/cosign-installer in the ci-dependencies group (#2028)

Bumps the ci-dependencies group with 1 update: [sigstore/cosign-installer](https://github.com/sigstore/cosign-installer).


Updates `sigstore/cosign-installer` from 3.8.2 to 3.9.1
- [Release notes](https://github.com/sigstore/cosign-installer/releases)
- [Commits](https://github.com/sigstore/cosign-installer/compare/v3.8.2...v3.9.1)

---
updated-dependencies:
- dependency-name: sigstore/cosign-installer
  dependency-version: 3.9.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: ci-dependencies
...

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

.github/workflows/docker-build-push.yaml

@@ -37,7 +37,7 @@ jobs:
             network=host
       - name: Install cosign
         if: github.event_name != 'pull_request'
-        uses: sigstore/cosign-installer@v3.8.2
+        uses: sigstore/cosign-installer@v3.9.1
       - name: Login to GitHub Container Registry
         uses: docker/login-action@v3
         if: github.event_name != 'pull_request'