Your requirements could not be resolved to an installable set of packages.
Problem 1
- orchestra/testbench[v6.24.0, ..., 6.x-dev] require phpunit/phpunit ^8.5.21 || ^9.5.10 -> found phpunit/phpunit[8.5.21, ..., 8.5.x-dev, 9.5.10, ..., 9.6.x-dev] but it conflicts with your root composer.json require (^10.3).
- Root composer.json requires orchestra/testbench ^6.24 -> satisfiable by orchestra/testbench[v6.24.0, ..., 6.x-dev].