Remove duplicate use statement (#2525)

Author: alcaeus

src/Relations/BelongsToMany.php

@@ -5,7 +5,6 @@
 use Illuminate\Database\Eloquent\Builder;
 use Illuminate\Database\Eloquent\Collection;
 use Illuminate\Database\Eloquent\Model;
-use Illuminate\Database\Eloquent\Model as EloquentModel;
 use Illuminate\Database\Eloquent\Relations\BelongsToMany as EloquentBelongsToMany;
 use Illuminate\Support\Arr;
 
@@ -347,7 +346,7 @@ public function getRelatedKey()
      * @param string $key
      * @return string
      */
-    protected function whereInMethod(EloquentModel $model, $key)
+    protected function whereInMethod(Model $model, $key)
     {
         return 'whereIn';
     }