Fix prune batches command interface check (laravel#35713)

The `Prunable` interface I added was renamed to `PrunableBatchRepository` post merge but was not also changed in the command interface check to see if the repository can be pruned.

src/Illuminate/Queue/Console/PruneBatchesCommand.php

@@ -4,7 +4,7 @@
 
 use Carbon\Carbon;
 use Illuminate\Bus\BatchRepository;
-use Illuminate\Bus\Prunable;
+use Illuminate\Bus\PrunableBatchRepository;
 use Illuminate\Console\Command;
 
 class PruneBatchesCommand extends Command
@@ -43,7 +43,7 @@ public function handle()
 
         $repository = $this->laravel[BatchRepository::class];
 
-        if ($repository instanceof Prunable) {
+        if ($repository instanceof PrunableBatchRepository) {
             $count = $repository->prune(Carbon::now()->subHours($this->option('hours')));
         }