tests suite failure: blocker composer plugin

[lukaszachy]

Testsuite fails in In the tests/run output:

cakephp/plugin-installer contains a Composer plugin which is blocked by your allow-plugins config. You may add it to the list if you consider it safe. See https://getcomposer.org/allow-plugins
You can run "composer config --no-plugins allow-plugins.cakephp/plugin-installer [true|false]" to enable it (true) or keep it disabled and suppress this warning (false)

FTR: Previously the message was

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.

[phracek]

@lukaszachy Can you please verify if the issue is still valid?