Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires orchestra/testbench 9.* -> satisfiable by orchestra/testbench[9.x-dev]. - orchestra/testbench 9.x-dev requires phpunit/phpunit ^10.5 || ^11.0.1 -> found phpunit/phpunit[dev-main, 10.5.0, ..., 10.5.x-dev, 11.0.1, ..., 11.1.x-dev (alias of dev-main)] but it conflicts with your root composer.json require (^9.6). Problem 2 - graham-campbell/testbench[v6.1.0, ..., 6.1.x-dev] require orchestra/testbench ^6.38 || ^7.35 || ^8.15 || ^9.0 -> satisfiable by orchestra/testbench[9.x-dev]. - graham-campbell/testbench[v6.0.0, ..., 6.0.x-dev] require orchestra/testbench ^6.25.1 || ^7.22.1 || ^8.0.4 -> found orchestra/testbench[v6.25.1, ..., 6.x-dev, v7.22.1, ..., 7.x-dev, v8.0.4, ..., 8.x-dev] but it conflicts with your root composer.json require (9.*). - orchestra/testbench 9.x-dev requires phpunit/phpunit ^10.5 || ^11.0.1 -> found phpunit/phpunit[dev-main, 10.5.0, ..., 10.5.x-dev, 11.0.1, ..., 11.1.x-dev (alias of dev-main)] but it conflicts with your root composer.json require (^9.6). - Root composer.json requires graham-campbell/testbench ^6.0 -> satisfiable by graham-campbell/testbench[v6.0.0, 6.0.x-dev, v6.1.0, 6.1.x-dev].

Process completed with exit code 2.

Node.js 16 actions are deprecated. Please update the following actions to use Node.js 20: actions/checkout@v2, actions/cache@v2. For more information see: https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/.