enable bug-bear linting rules

pkgs/clan-cli/clan_cli/api/admin.py

@@ -27,12 +27,14 @@ def set_admin_service(
     base_url: str,
     allowed_keys: dict[str, str],
     instance_name: str = "admin",
-    extra_machines: list[str] = [],
+    extra_machines: list[str] | None = None,
 ) -> None:
     """
     Set the admin service of a clan
     Every machine is by default part of the admin service via the 'all' tag
     """
+    if extra_machines is None:
+        extra_machines = []
     inventory = load_inventory_eval(base_url)
 
     if not allowed_keys: