chore: sync template versions with image updates

library/compose/loki/template.yaml

@@ -12,7 +12,7 @@ metadata:
     * **Project:** https://grafana.com/oss/loki/
     * **Documentation:** https://grafana.com/docs/loki/latest/
     * **GitHub:** https://github.com/grafana/loki
-  version: 3.6.2
+  version: 3.6.3
   author: Christian Lempa
   date: '2025-12-11'
   tags: