[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

tests/test_booster/test_mixed_precision/test_fp16_torch.py

@@ -34,6 +34,7 @@ def run_torch_amp(rank, world_size, port):
         optimizer.step()
         del model, optimizer, criterion, data, output, mixed_precision
 
+
 @rerun_if_address_is_in_use()
 def test_torch_ddp_plugin():
     spawn(run_torch_amp, 1)