Fixes query attribute not existing under strict mode

[daika7ana]

When saving a model and Model::shouldBeStrict() is enabled, or to be more precise Model::preventAccessingMissingAttributes(), the $query attribute will not be accessible with the following error:

The attribute [query] either does not exist or was not retrieved for model [App\Models\ExampleModel].
{"userId":1,"exception":"[object] (Illuminate\\Database\\Eloquent\\MissingAttributeException(code: 0): 
The attribute [query] either does not exist or was not retrieved for model [App\\Models\\ExampleModel]. 
at /app/vendor/laravel/framework/src/Illuminate/Database/Eloquent/Concerns/HasAttributes.php:475)

This PR should fix this issue without impacting any functionality. Will solve #437.

[SkyLundy]

Thanks for this fix. Solved the issue for me.