Removed deprecated code in TestSuites

We can't do this while we are still on PHPUnit 9.

This is taken care of in 📌 Upgrade PHPUnit to 10, drop Symfony PHPUnit-bridge dependency Fixed , which (amidst all the others) includes exactly the same changes.

Suggest to close as dupe, or we might want to remove the change in 📌 Upgrade PHPUnit to 10, drop Symfony PHPUnit-bridge dependency Fixed , and do it here as a follow up of 📌 Upgrade PHPUnit to 10, drop Symfony PHPUnit-bridge dependency Fixed , inwhich case this needs to be postponed.

Let's postpone for now at least.

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