treefmt/ruff: Set python lint version to 3.13. Fix all new lints coming up.

pkgs/clan-cli/clan_cli/tests/helpers/nixos_config.py

@@ -1,11 +0,0 @@
-from collections import defaultdict
-from collections.abc import Callable
-from typing import Any
-
-
-def def_value() -> defaultdict:
-    return defaultdict(def_value)
-
-
-# allows defining nested dictionary in a single line
-nested_dict: Callable[[], dict[str, Any]] = lambda: defaultdict(def_value)