Fix compatibility with --prefer-lowest in test suite

[caendesilva]

Tests running on with composer --prefer-lowest are failing. Raising this issue to investigate.

[caendesilva]

Root cause for all four fails is Call to undefined method Illuminate\Testing\PendingCommand::expectsOutputToContain()

[caendesilva]

Illuminate\Testing\PendingCommand::expectsOutputToContain() was added inhttps://github.com/laravel/framework/pull/40984 an released in https://github.com/laravel/framework/releases/tag/v9.2.0, but laravel-zero https://github.com/laravel-zero/laravel-zero/blob/master/composer.json requires minimum v9.0.0.

[caendesilva]

Confirmed the file used when running the latest versions is vendor\illuminate\testing\PendingCommand.php, am so far unable to include it when setting minimum to 9.2.

[caendesilva]

Since Hyde is not a traditional package in the sense it needs to be compatible with existing installations as it is a framework on its own I will close this and remove the --prefer-lowest in the matrix.