Support Laravel 11 and update dependencies

[Jubeki]

This PR adds Support for Laravel 11 and Symfony 7.

• symfony/yaml:^7.0 has no breaking changes it seems: https://github.com/symfony/yaml/blob/7.0/CHANGELOG.md
• Laravel 8 uses Symfony 5 and is already not supported anymore, therefor being dropped here (orchestra/testbench is updated accordingly)
• Updated some versions in Github Actions

Because Laravel Sail doesn't have Tests, I manually checked the installation on Laravel 11 using the following script: (Requirements: Docker is running, PHP8.2 is used)

laravel new sail-laravel11 --dev --no-interaction
cd sail-laravel11
composer config repositories.sail vcs https://github.com/Jubeki/laravel-sail.git
composer require laravel/sail:dev-laravel11 --dev
php artisan sail:install --with=mysql

vendor/bin/sail up -d --wait
vendor/bin/sail artisan migrate
open http://localhost

Please don't forget to stop the docker container after testing:

vendor/bin/sail down