Your requirements could not be resolved to an installable set of packages.
Problem 1
- phpunit/phpunit[dev-main, 11.2.6] require php >=8.2 -> your php version (7.4.33) does not satisfy that requirement.
- phpunit/phpunit 11.3.x-dev is an alias of phpunit/phpunit dev-main and thus requires it to be installed too.
- Root composer.json requires phpunit/phpunit ^11.2.6 -> satisfiable by phpunit/phpunit[11.2.6, 11.2.x-dev, 11.3.x-dev (alias of dev-main)].