OZG-4460 OZG-4495 extend javadoc

user-manager-server/src/main/java/de/itvsh/kop/user/keycloak/OlderUserRepresentation.java

@@ -10,6 +10,8 @@ import com.fasterxml.jackson.annotation.JsonIgnore;
  * was updated to 22.0.5. The reason for that is the new resteasy client based on Jakarata EE 10 (jakarta.ws.rs-api). Keycloak admin client 20 .0.3 is
  * based on Jersey (javax.ws.rs-api). What we do here is simple ignoring one field added in the newer version of Keycloak in order for entity to be
  * processable by the older version. Once Keycloak will be upgraded we can remove this class.
+ *
+ * The workaround was discussed with Quarkus team https://github.com/quarkusio/quarkus/discussions/36766
  */
 class OlderUserRepresentation extends UserRepresentation {