fix: error message in main module (#661)

Author: shemau

variables.tf

@@ -26,7 +26,7 @@ variable "postgresql_version" {
       var.postgresql_version == "14",
       var.postgresql_version == "13",
     ])
-    error_message = "Version must be 12, 13, 14, 15 or 16. If no value passed, the current ICD preferred version is used."
+    error_message = "Version must be 13, 14, 15, 16 or 17. If no value passed, the current ICD preferred version is used."
   }
 }