Fix: Correct import to resolve TypeError in RefundItemCollection

[bobab12]

Got this TypeError while unserializing a RefundProcessed event from a queue:

TypeError: Illuminate\Database\Eloquent\Relations\HasMany::match(): Argument #2 ($results) must be of type Illuminate\Database\Eloquent\Collection, Laravel\Cashier\Refunds\RefundItemCollection given, called in /srv/app/vendor/laravel/framework/src/Illuminate/Database/Eloquent/Builder.php on line 785 and defined in /srv/app/vendor/laravel/framework/src/Illuminate/Database/Eloquent/Relations/HasMany.php:60

The error occurred because RefundItemCollection extended Illuminate\Support\Collection instead of Illuminate\Database\Eloquent\Collection, leading to a type mismatch in Eloquent relationships that require the latter.

This change fixes the issue by extending from the correct Eloquent\Collection.

[sandervanhooft]

Good catch!

[sandervanhooft]

Patched and released, thanks @bobab12 !