update to 2.18.0

Signed-off-by: Tao Liu <liutaoaz@amazon.com>

Author: Flyingliuhub

config/playground/helm/preview/helm-opensearch-dashboards.yaml

@@ -11,7 +11,7 @@ replicaCount: 3
 image:
   repository: "opensearchproject/opensearch-dashboards"
   # override image tag, which is .Chart.AppVersion by default
-  tag: "2.17.0"
+  tag: "2.18.0"
   pullPolicy: "Always"
 
 imagePullSecrets: []

config/playground/helm/preview/helm-opensearch.yaml

@@ -113,7 +113,7 @@ hostAliases: []
 image:
   repository: "opensearchproject/opensearch"
   # override image tag, which is .Chart.AppVersion by default
-  tag: "2.17.0"
+  tag: "2.18.0"
   pullPolicy: "Always"
 
 podAnnotations: {}