Your requirements could not be resolved to an installable set of packages.
Problem 1
- Root composer.json requires orchestra/testbench 6.22.* -> satisfiable by orchestra/testbench[v6.22.0].
- orchestra/testbench v6.22.0 requires php ^7.3 || ^8.0 -> your php version (7.2.34) does not satisfy that requirement.
Problem 2
- laravel/framework[v8.0.0, ..., v8.11.2] require php ^7.3 -> your php version (7.2.34) does not satisfy that requirement.
- laravel/framework[v8.12.0, ..., v8.83.27] require php ^7.3|^8.0 -> your php version (7.2.34) does not satisfy that requirement.
- Root composer.json requires laravel/framework 8.* -> satisfiable by laravel/framework[v8.0.0, ..., v8.83.27].