Fix scoped route model binding

[bencarr]

When using scoped route model binding with a child model that uses a SQID as its route key, the child model is not properly scoped to the parent.

Route::get('/customers/{customer}/{charge}')->scopeBindings();

When applying the ->whereSqid() condition, the HasSqids trait currently re-instantiates a query from the trait's parent Model instance rather than chaining onto the provided $query parameter, which would contain and instance of the parent's scoped relationship.

// HasSqids.php
public function resolveRouteBindingQuery($query, $value, $field = null): Builder|Relation 
{
    // ...

    // Current behavior
    return $this->whereSqid(sqid: $value); // Equivalent to Charge::query()->whereSqid(sqid: $value);

    // Proposed behavior
    return $query->whereSqid(sqid: $value); // Equivalent to $customer->charges->whereSqid(sqid: $value);
}

[bensherred]

Thanks @bencarr, this is great