ci (docker.yml): bump bake version

Author: pythoninthegrass

.github/workflows/docker.yml

@@ -86,7 +86,7 @@ jobs:
           platforms: linux/amd64,linux/arm64
 
       - name: Build and push with Docker Bake
-        uses: docker/bake-action@v4
+        uses: docker/bake-action@v6
         with:
           files: |
             ./docker-bake.hcl