ensure code style fixes/checks are always made with the same version for everyone and don't depend on the dependencies installed for kalkun
run tests from php 5.6 to the latest php version (list of released versions is dynamically fetched from php.net). BTW adding support for phpunit ranges from phpunit4 to phpunit10.
fix some code deprecations reported by php 8.1 & 8.2
add patches to add support for php 8.2 to dependencies (ci3 & kenjis/ci-phpunit-test)
This will: