updated list of supported kubernetes OKE versions

Author: junior

deploy/complete/terraform/schema.yaml

@@ -217,10 +217,9 @@ variables:
     type: enum
     enum: # Necessary hardcoded supported versions, as ORM does not retrieve the versions from OKE.
     - "Latest"
-    - "v1.19.7"
+    - "v1.20.8"
+    - "v1.19.12"
     - "v1.18.10"
-    - "v1.17.13"
-    - "v1.16.15"
     title: "Kubernetes Version"
     required: true
     visible: