[9.x] Remove static return types

[browner12]

I would definitely like a second set of eyes on this, but I'm pretty sure these methods will only return instances of the Eloquent or Query Builder. It was a little difficult to find how these methods are called, but it's in the \Illuminate\Database\Eloquent\SoftDeletingScope.

The reason I came across this was that I was trying to select trashed Eloquent models on a specific database connection.

$user = User::withTrashed()->on($connection);

This doesn't actually work, but the IDE thinks it's okay, because it sees withTrashed() returning static, which is \App\User which extends the \Illuminate\Database\Eloquent\Model, which does have the on() method.

In reality, it returns the \Illuminate\Database\Eloquent\Builder which does not have the on() method.

[browner12]

originally from commit 7b91285

[browner12]

On a related note, any ideas on how to get all models, including trashed, on a specific connection?