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

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

Author: pre-commit-ci[bot]

src/lightning/fabric/cli.py

@@ -14,8 +14,6 @@
 import logging
 import os
 import re
-import subprocess
-import sys
 from argparse import Namespace
 from typing import Any, Optional