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

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Author: pre-commit-ci[bot]

src/lightning/pytorch/trainer/connectors/callback_connector.py

@@ -18,7 +18,6 @@
 from datetime import timedelta
 from typing import Optional, Union
 
-from lightning_utilities import module_available
 from lightning_utilities.core.imports import RequirementCache
 
 import lightning.pytorch as pl