Update sigstore cosign versioning

.github/workflows/docker-publish.yml

@@ -39,10 +39,9 @@ jobs:
       # https://github.com/sigstore/cosign-installer
       - name: Install cosign
         if: github.event_name != 'pull_request'
-        uses: sigstore/cosign-installer@v2.8.1
+        uses: sigstore/cosign-installer@v3.5.0
         with:
-          cosign-release: 'v1.13.1'
-
+          cosign-release: 'v2.1.1'
 
       # Workaround: https://github.com/docker/build-push-action/issues/461
       - name: Setup Docker buildx
@@ -67,6 +66,7 @@ jobs:
           images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
           tags: |
             type=raw,value=latest,enable=${{ github.ref == format('refs/heads/{0}', 'main') }}
+
       # Build and push Docker image with Buildx (don't push on PR)
       # https://github.com/docker/build-push-action
       - name: Build and push Docker image
@@ -81,7 +81,6 @@ jobs:
           cache-from: type=gha
           cache-to: type=gha,mode=max
 
-
       # Sign the resulting Docker image digest except on PRs.
       # This will only write to the public Rekor transparency log when the Docker
       # repository is public to avoid leaking data.  If you would like to publish