Synchronize IDLJ version

[pzygielo]

Currently

$ LANG=en_GB.UTF-8 java -jar idlj-4.2.4.jar -i idl idl/orb.idl
$ grep -B2 -A3 "4\\.1" org/omg/CORBA/WStringValueHelper.java
/**
* org/omg/CORBA/WStringValueHelper.java .
* Generated by the IDL-to-Java compiler (portable), version "4.1"
* from idl/orb.idl
* Friday, 2 December 2022 at 11:55:30 Central European Standard Time
*/

and for Japanese:

$ LANG=ja_JP.UTF-8 java -jar idlj-4.2.4.jar -i idl idl/orb.idl
$ grep -B2 -A3 "3\\.1" org/omg/CORBA/WStringValueHelper.java
/**
* org/omg/CORBA/WStringValueHelper.java .
* IDL-to-Java コンパイラ (ポータブル), バージョン "3.1" で生成
* 生成元: idl/orb.idl
* 2022年12月3日 7時11分33秒 JST
*/