Fix bus service provider when loaded outside of the framework (#39740)

Author: GrahamCampbell

src/Illuminate/Bus/BusServiceProvider.php

@@ -46,8 +46,8 @@ protected function registerBatchServices()
         $this->app->singleton(DatabaseBatchRepository::class, function ($app) {
             return new DatabaseBatchRepository(
                 $app->make(BatchFactory::class),
-                $app->make('db')->connection(config('queue.batching.database')),
-                config('queue.batching.table', 'job_batches')
+                $app->make('db')->connection($app->config->get('queue.batching.database')),
+                $app->config->get('queue.batching.table', 'job_batches')
             );
         });
     }