Merge pull request #29 from f-koehler/renovate/sigstore-cosign-installer-3.x

Update sigstore/cosign-installer action to v3.9.1

Author: f-koehler

.github/workflows/docker.yml

@@ -30,7 +30,7 @@ jobs:
       # https://github.com/sigstore/cosign-installer
       - name: Install cosign
         if: github.event_name != 'pull_request'
-        uses: sigstore/[email protected].0
+        uses: sigstore/[email protected].1
         with:
           cosign-release: "v2.2.4"