Revert "Downgrade loki because of mem leak"

This reverts commit 52489642.

flux2/apps/monitoring/loki-values-configmap.yaml

@@ -7,11 +7,6 @@ metadata:
 data:
   values.yaml: |
     # https://github.com/grafana/helm-charts/blob/main/charts/loki/values.yaml
-    image:
-      repository: grafana/loki
-      # Downgrade loki because of mem leak
-      # (https://open.greenhost.net/stackspin/stackspin/-/issues/1077)
-      tag: 2.4.0
     resources:
       limits:
         cpu: 800m