Your requirements could not be resolved to an installable set of packages.
Problem 1
- psy/psysh dev-main requires php ^8.0 || ^7.4 -> your php version (7.2.34) does not satisfy that requirement.
- psy/psysh 0.12.x-dev is an alias of psy/psysh dev-main and thus requires it to be installed too.
- Root composer.json requires psy/psysh ^0.12 -> satisfiable by psy/psysh[0.12.x-dev (alias of dev-main)].