[10.x] Narrow down array type for $attributes in CastsAttributes

[devfrey]

The documentation contains an example with an array<string, mixed> type hint for $attributes, which is more specific than array, as type hinted in the source. However, if I wanted to use the more specific type hint from the example in my application, PHPStan reports the following:

Parameter #4 $attributes (array<string, mixed>) of method App\Casts\MyCast::get() should be contravariant with parameter $attributes (array) of method Illuminate\Contracts\Database\Eloquent\CastsAttributes<App\Value\MyValueObject,string>::get()

So I propose to update the type hint in the source to be consistent with the example in the documentation. Thanks!

Edit: the make:cast stub also uses the array<string, mixed> type hint.