Your requirements could not be resolved to an installable set of packages.
Problem 1
- orchestra/testbench[v7.19.0, ..., 7.x-dev] require phpunit/phpunit ^9.5.10 -> found phpunit/phpunit[9.5.10, ..., 9.6.x-dev] but it conflicts with your root composer.json require (^10.0).
- Root composer.json requires orchestra/testbench ^7.19 -> satisfiable by orchestra/testbench[v7.19.0, ..., 7.x-dev].