Your requirements could not be resolved to an installable set of packages.
Problem 1
- orchestra/testbench[v8.0.0, ..., 8.x-dev] require symfony/yaml ^6.2 -> found symfony/yaml[v6.2.0-BETA1, ..., 6.4.x-dev] but it conflicts with your root composer.json require (^7.0).
- Root composer.json requires orchestra/testbench 8.* -> satisfiable by orchestra/testbench[v8.0.0, ..., 8.x-dev].