No run over php version 8.1.25

[sebastotcl]

Your requirements could not be resolved to an installable set of packages.

Problem 1
- phpunit/phpunit[6.0.0, ..., 6.5.14] require php ^7.0 -> your php version (8.1.25) does not satisfy that requirement.
- Root composer.json requires phpunit/phpunit ~6.0 -> satisfiable by phpunit/phpunit[6.0.0, ..., 6.5.14].

Tnx in advance