After composer require vemcogroup/laravel-sparkpost-driver
Problem 1
vemcogroup/laravel-sparkpost-driver 5.0.0 requires laravel/framework ^9.0 -> found laravel/framework[v9.0.0-beta.1, ..., 9.x-dev] but it conflicts with your root composer.json require (^8.40).
vemcogroup/laravel-sparkpost-driver[5.0.1, ..., 5.0.3] require php ^8.0.2 -> your php version (7.3.13) does not satisfy that requirement.
After
composer require vemcogroup/laravel-sparkpost-driver
Problem 1