ci: lift concurrency limits

Author: mxmehl

.github/workflows/hugo.yaml

@@ -18,7 +18,7 @@ on:
 # Allow only one concurrent deployment. However, do NOT cancel in-progress runs as we want to allow
 # especially production deployments to complete.
 concurrency:
-  group: "pages"
+  group: pages-${{ github.ref_name }}
   cancel-in-progress: false
 
 # Set environment variables which will be used multiple times in the workflow