fix(returnStatus): the return status should be 404

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: Theo-lbg

src/test/resources/features/delete_user.feature

@@ -14,4 +14,4 @@ Feature: Delete user endpoint
 
   Scenario: Delete a user that does not exist
     When the client call to DELETE /random-users/999
-    Then the response status should be 204
+    Then the response status should be 404