[scala] add [date-time] field to codegen unit test (#3939)

modules/openapi-generator/src/test/resources/3_0/scala_reserved_words.yaml

@@ -75,6 +75,9 @@ components:
           type: string
         foobar:
           type: boolean
+        created_at:
+          type: string
+          format: date-time
       required:
         - id
         - try
@@ -82,3 +85,4 @@ components:
         - finally
         - lazy
         - foobar
+        - created_at

modules/openapi-generator/src/test/resources/codegen/scala/SomeObj.scala.txt

@@ -36,7 +36,8 @@ case class SomeObj (
   `lazy`: String,
   `private`: Option[String] = None,
   `type`: Option[String] = None,
-  foobar: Boolean
+  foobar: Boolean,
+  createdAt: DateTime
 ) extends ApiModel
 
 object SomeObjEnums {