Update schema.yaml

Updated OKE version.

Author: smithzc

schema.yaml

@@ -113,13 +113,13 @@ variables:
   kubernetes_version:
     type: enum
     enum:
+    - "v1.26.2
     - "v1.25.4"
     - "v1.24.1"
-    - "v1.23.4"
     title: "Kubernetes Version"
     description: "Choose the version of Kubernetes to deploy"
     required: true
-    default: "v1.25.4"
+    default: "v1.26.2"
 
   cluster_name:
     type: string