fix(k3s): downgrade Loki image tag to 3.7.9

flux/infrastructure/infra-monitor/helmrelease-loki.yaml

@@ -31,7 +31,7 @@ spec:
       allocatedMemory: 1024
     loki:
       image:
-        tag: 3.9.7
+        tag: 3.7.9
       auth_enabled: false
       commonConfig:
         replication_factor: 1