Apply fixes from StyleCI

Author: StyleCIBot

src/Illuminate/Http/Client/Batch.php

@@ -8,7 +8,6 @@
 use GuzzleHttp\Promise\EachPromise;
 use GuzzleHttp\Utils;
 use Illuminate\Http\Client\Promises\LazyPromise;
-use Illuminate\Support\Collection;
 use Illuminate\Support\Defer\DeferredCallback;
 
 use function Illuminate\Support\defer;