unused imports

Author: awaelchli

tests/deprecated_api/test_remove_1-6.py

@@ -20,11 +20,9 @@
 from pytorch_lightning import Trainer
 from pytorch_lightning.callbacks import ModelCheckpoint
 from pytorch_lightning.callbacks.early_stopping import EarlyStopping
-from pytorch_lightning.plugins import ClusterEnvironment
 from pytorch_lightning.plugins.environments import (
     KubeflowEnvironment,
     LightningEnvironment,
-    LSFEnvironment,
     SLURMEnvironment,
     TorchElasticEnvironment,
 )