chore(deps): update docker.io/grafana/loki docker tag to v3.5.6 (#1322)

* chore(deps): update docker.io/grafana/loki docker tag to v3.5.6

* chore: sync template versions with image updates

---------

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

library/compose/loki/compose.yaml.j2

@@ -1,7 +1,7 @@
 services:
   loki:
     container_name: loki
-    image: docker.io/grafana/loki:3.5.5
+    image: docker.io/grafana/loki:3.5.6
     command: "-config.file=/etc/loki/config.yaml"
     ports:
       # --> (Optional) Remove when using traefik...

library/compose/loki/template.yaml

@@ -12,9 +12,9 @@ metadata:
     Documentation: https://grafana.com/docs/loki/latest/
 
     GitHub: https://github.com/grafana/loki
-  version: 3.5.3
+  version: 3.5.6
   author: Christian Lempa
-  date: '2025-09-28'
+  date: '2025-10-10'
   tags:
     - grafana
     - monitoring