Fix testing.

Author: dereuromark

docs/en/development/testing.md

@@ -19,7 +19,7 @@ through using either a [PHAR package](https://phpunit.de/#download) or
 To install PHPUnit with Composer:
 
 ``` bash
-$ php composer.phar require --dev phpunit/phpunit:"^10.1"
+$ php composer.phar require --dev phpunit/phpunit:"^11.5.3"
 ```
 
 This will add the dependency to the `require-dev` section of your

docs/ja/development/testing.md

@@ -20,7 +20,7 @@ PHPUnit は [Composer](https://getcomposer.org) または [PHAR パッケージ]
 Composer で PHPUnit をインストールする場合:
 
 ``` bash
-$ php composer.phar require --dev phpunit/phpunit:"^8.5"
+$ php composer.phar require --dev phpunit/phpunit:"^11.5.3"
 ```
 
 コマンドラインで上記のように実行すると、 `composer.json` の `require-dev` セクションに