[5.7] Delete unneeded type check, since it will never be true (#26053)

Actually, we should not check the `$data instanceof Collection`, since Collection implements an `Arrayable` which checked before this.

src/Illuminate/Http/Resources/Json/JsonResource.php

@@ -93,7 +93,7 @@ public function resolve($request = null)
 
         if (is_array($data)) {
             $data = $data;
-        } elseif ($data instanceof Arrayable || $data instanceof Collection) {
+        } elseif ($data instanceof Arrayable) {
             $data = $data->toArray();
         } elseif ($data instanceof JsonSerializable) {
             $data = $data->jsonSerialize();