chore(container)!: Update ghcr.io/prometheus-community/charts/kube-prometheus-stack Docker tag to v81

Signed-off-by: budimanjojo-bot <111944664+budimanjojo-bot[bot]@users.noreply.github.com>

Author: budimanjojo-bot[bot]

cluster/apps/monitoring-system/kube-prometheus/stack/base/helmrelease.yaml

@@ -9,7 +9,7 @@ spec:
   timeout: 60s
   url: oci://ghcr.io/prometheus-community/charts/kube-prometheus-stack
   ref:
-    tag: 73.2.3
+    tag: 81.4.2
   layerSelector:
     mediaType: application/vnd.cncf.helm.chart.content.v1.tar+gzip
     operation: copy