chore(deps): update helm release external-dns to v1.18.0 (#552)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

argocd/waiter/external-dns/app.yaml

@@ -16,7 +16,7 @@ spec:
       - CreateNamespace=true
   sources:
     - repoURL: https://kubernetes-sigs.github.io/external-dns/
-      targetRevision: 1.16.1
+      targetRevision: 1.18.0
       chart: external-dns
       helm:
         valueFiles: