Fix linter again

Author: rchiodo

src/debugpy/adapter/clients.py

@@ -7,7 +7,7 @@
 import atexit
 import os
 import sys
-from typing import TYPE_CHECKING, Any, Callable, Literal, Union, cast
+from typing import Any, Callable, Union, cast
 
 import debugpy
 from debugpy import adapter, common, launcher