Fix parameter types (laravel#43403)

src/Illuminate/Foundation/Testing/Concerns/InteractsWithDatabase.php

@@ -167,7 +167,7 @@ protected function isSoftDeletableModel($model)
     /**
      * Cast a JSON string to a database compatible type.
      *
-     * @param  array|string  $value
+     * @param  array|object|string  $value
      * @return \Illuminate\Database\Query\Expression
      */
     public function castAsJson($value)