Allow `composer/xdebug-handler` v2 (#6179)
Allow `composer/xdebug-handler` v2 (#6179)

Hopefully this fixes:

```
  Problem 1
    - friendsofphp/php-cs-fixer is locked to version v3.0.0-rc.1 and an update of this package was not requested.
    - rector/rector 0.10.6 requires composer/xdebug-handler ^1.4 -> satisfiable by composer/xdebug-handler[1.4.0, ..., 1.4.6].
    - You can only install one version of a package, so only one of these can be installed: composer/xdebug-handler[1.4.0, ..., 1.4.6, 2.0.0].
    - friendsofphp/php-cs-fixer v3.0.0-rc.1 requires composer/xdebug-handler ^2.0 -> satisfiable by composer/xdebug-handler[2.0.0].
    - Root composer.json requires rector/rector ^0.10.6 -> satisfiable by rector/rector[0.10.6].
```
RectorPHP/Rector