Update ghcr.io/grafana-community/helm-charts/loki Docker tag to v18.4.0

[renovate]

This PR contains the following updates:

Package	Update	Change
ghcr.io/grafana-community/helm-charts/loki (source)	minor	18.1.1 → 18.4.0

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[lucadevbot]

--- apps/monitoring/loki/app Kustomization: flux-system/loki OCIRepository: monitoring/loki

+++ apps/monitoring/loki/app Kustomization: flux-system/loki OCIRepository: monitoring/loki

@@ -10,9 +10,9 @@

 spec:
   interval: 30m
   layerSelector:
     mediaType: application/vnd.cncf.helm.chart.content.v1.tar+gzip
     operation: copy
   ref:
-    tag: 18.1.1
+    tag: 18.3.0
   url: oci://ghcr.io/grafana-community/helm-charts/loki
 

[lucadevbot]

--- HelmRelease: monitoring/loki StatefulSet: monitoring/loki

+++ HelmRelease: monitoring/loki StatefulSet: monitoring/loki

@@ -12,15 +12,12 @@

   replicas: 1
   podManagementPolicy: Parallel
   updateStrategy:
     rollingUpdate:
       partition: 0
   serviceName: loki-headless
-  persistentVolumeClaimRetentionPolicy:
-    whenDeleted: Delete
-    whenScaled: Delete
   revisionHistoryLimit: 10
   selector:
     matchLabels:
       app.kubernetes.io/name: loki
       app.kubernetes.io/instance: loki
       app.kubernetes.io/component: single-binary