Update Helm release cilium to v1.18.0

Author: renovate[bot]

apps/on-prem/cilium.yaml

@@ -14,7 +14,7 @@ spec:
   sources:
     - repoURL: 'https://helm.cilium.io/'
       chart: cilium
-      targetRevision: 1.17.4
+      targetRevision: 1.18.0
       helm:
         valueFiles:
           - $values/values/on-prem/cilium.yaml