The fix in 66568e3a39 prevented an error
when installing phpcompatibility/php-compatibility but there was still
a warning before that when installing dealerdirect/phpcodesniffer-composer-installer.
With Composer 2.3.9, this is now an error too, so we need to move
the config change before that: https://getcomposer.org/changelog/2.3.9
> For additional security you should declare the allow-plugins config with a list of packages names that are allowed to run code. See https://getcomposer.org/allow-plugins
> You have until July 2022 to add the setting. Composer will then switch the default behavior to disallow all plugins.
Oops, it is July now.
