cli: fix typing of _get_script_path return

Author: dlech

pybricksdev/cli/__init__.py

@@ -14,7 +14,7 @@
 import validators
 
 from abc import ABC, abstractmethod
-from os import path
+from os import PathLike, path
 
 import argcomplete
 from argcomplete.completers import FilesCompleter
@@ -54,7 +54,7 @@ async def run(self, args: argparse.Namespace):
         pass
 
 
-def _get_script_path(file: TextIO) -> ContextManager:
+def _get_script_path(file: TextIO) -> ContextManager[PathLike]:
     """
     Gets the path to a script on the file system.