Update for Laravel 9

[kgrammer]

When I attempt to install this with Laravel 9, I get the following error(s):

Problem 1
- laravel-frontend-presets/zurb-foundation[v2.1.0, ..., v2.1.1] require laravel/framework ^5.5 -> found laravel/framework[v5.5.0, ..., 5.8.x-dev] but it conflicts with your root composer.json require (^9.11).
- laravel-frontend-presets/zurb-foundation v2.1.2 requires laravel/framework ^5.5|^7.0 -> found laravel/framework[v5.5.0, ..., 5.8.x-dev, v7.0.0, ..., 7.x-dev] but it conflicts with your root composer.json require (^9.11).
- Root composer.json requires laravel-frontend-presets/zurb-foundation ^2.1 -> satisfiable by laravel-frontend-presets/zurb-foundation[v2.1.0, v2.1.1, v2.1.2].

Can you update the composer.json file to support Laravel 9?