chore(deps): update grafana/tempo docker tag to v2.8.1

Author: renovate[bot]

software/roles/docker_compose_apps/templates/observability/docker-compose.yml

@@ -25,7 +25,7 @@ services:
       - rproxy
 
   tempo:
-    image: grafana/tempo:2.5.0
+    image: grafana/tempo:2.8.1
     command: [ "-config.file=/etc/tempo.yaml" ]
     restart: unless-stopped
     volumes: