Add Link to Laravel Sail (#6889)

All the github links to laravel projects' are included except for laravel Sail. This is just an addition

Author: jamesdube

contributions.md

@@ -37,6 +37,7 @@ The Laravel source code is managed on GitHub, and there are repositories for eac
 - [Laravel Horizon](https://github.com/laravel/horizon)
 - [Laravel Jetstream](https://github.com/laravel/jetstream)
 - [Laravel Passport](https://github.com/laravel/passport)
+- [Laravel Sail](https://github.com/laravel/sail)
 - [Laravel Sanctum](https://github.com/laravel/sanctum)
 - [Laravel Scout](https://github.com/laravel/scout)
 - [Laravel Socialite](https://github.com/laravel/socialite)