fix(generate_cli): fixed type annotations

tests/unit_tests/test_generate_cli_client.py

@@ -65,6 +65,8 @@ def test_client_generator_with_black_formatting():
         '''\
         # This file was automatically generated by generate_cli.py
 
+        from __future__ import annotations
+
         import enum
         from typing import Literal, Optional, overload