Your requirements could not be resolved to an installable set of packages.
Problem 1
- orchestra/testbench[v6.23.0, ..., v6.44.2] require phpunit/phpunit ^8.5.21 || ^9.5.10 -> found phpunit/phpunit[8.5.21, ..., 8.5.38, 9.5.10, ..., 9.6.19] but it conflicts with your root composer.json require (^10.5|^11.0).
- Root composer.json requires orchestra/testbench ^6.23 -> satisfiable by orchestra/testbench[v6.23.0, ..., v6.44.2].