[tools]: Update friendsofphp/php-cs-fixer requirement

Updates the requirements on [friendsofphp/php-cs-fixer](https://github.com/FriendsOfPHP/PHP-CS-Fixer) to permit the latest version.
- [Release notes](https://github.com/FriendsOfPHP/PHP-CS-Fixer/releases)
- [Changelog](https://github.com/FriendsOfPHP/PHP-CS-Fixer/blob/3.0/CHANGELOG.md)
- [Commits](PHP-CS-Fixer/PHP-CS-Fixer@v2.18.0...v3.0.0)

Signed-off-by: dependabot[bot] <support@github.com>

tools/php-cs-fixer/composer.json

@@ -7,6 +7,6 @@
         "ext-json": "*",
         "ext-mbstring": "*",
         "ext-sodium": "*",
-        "friendsofphp/php-cs-fixer": "^2.18"
+        "friendsofphp/php-cs-fixer": "^3.0"
     }
 }