Code improvements from new Ruff checks (#11498)

tests/typecheck_typeshed.py

@@ -21,7 +21,7 @@ EMPTY: list[str] = []
 parser = argparse.ArgumentParser(description="Run mypy on typeshed's own code in the `scripts` and `tests` directories.")
 parser.add_argument(
     "dir",
-    choices=DIRECTORIES_TO_TEST + (EMPTY,),
+    choices=(*DIRECTORIES_TO_TEST, EMPTY),
     nargs="*",
     action="extend",
     help=f"Test only these top-level typeshed directories (defaults to {DIRECTORIES_TO_TEST!r})",