machines.update: remove redundant flake argument

pkgs/clan-cli/clan_cli/machines/update.py

@@ -147,12 +147,6 @@ def register_update_parser(parser: argparse.ArgumentParser) -> None:
         nargs="*",
         default=[],
     )
-    parser.add_argument(
-        "--flake",
-        type=str,
-        help="name of the flake to update machine for",
-        default=None,
-    )
     parser.add_argument(
         "--target-host",
         type=str,