Code not working in Python 3.14 but works in previous python versions

[bashirmindee]

🐛 Bug

Description

code not working in python 3.14

Checklist

• I checked on the latest version of Hydra
• I created a minimal repro (See this for tips).

To reproduce

** Minimal Code/Config snippet to reproduce **

# run the code like this: python script.py
import hydra

@hydra.main()
def main(cfg) -> None:
    pass

main()

** Stack trace/error message **

/home/bashir/monolith-api/bla.py:3: UserWarning: 
The version_base parameter is not specified.
Please specify a compatability version level, or None.
Will assume defaults for version 1.1
  @hydra.main()
/home/bashir/monolith-api/bla.py:3: UserWarning: 
config_path is not specified in @hydra.main().
See https://hydra.cc/docs/1.2/upgrades/1.0_to_1.1/changes_to_hydra_main_config_path for more information.
  @hydra.main()
Traceback (most recent call last):
  File "/home/bashir/.pyenv/versions/3.14-dev/lib/python3.14/argparse.py", line 1744, in _check_help
    formatter._expand_help(action)
    ~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^
  File "/home/bashir/.pyenv/versions/3.14-dev/lib/python3.14/argparse.py", line 661, in _expand_help
    if '%' not in help_string:
       ^^^^^^^^^^^^^^^^^^^^^^
TypeError: argument of type 'LazyCompletionHelp' is not a container or iterable

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/home/bashir/monolith-api/bla.py", line 7, in <module>
    main()
    ~~~~^^
  File "/home/bashir/monolith-api/venv314dev/lib/python3.14/site-packages/hydra/main.py", line 85, in decorated_main
    args_parser = get_args_parser()
  File "/home/bashir/monolith-api/venv314dev/lib/python3.14/site-packages/hydra/_internal/utils.py", line 547, in get_args_parser
    parser.add_argument(
    ~~~~~~~~~~~~~~~~~~~^
        "--shell-completion",
        ^^^^^^^^^^^^^^^^^^^^^
    ...<2 lines>...
        help=LazyCompletionHelp(),  # type: ignore
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    )
    ^
  File "/home/bashir/.pyenv/versions/3.14-dev/lib/python3.14/argparse.py", line 1558, in add_argument
    self._check_help(action)
    ~~~~~~~~~~~~~~~~^^^^^^^^
  File "/home/bashir/.pyenv/versions/3.14-dev/lib/python3.14/argparse.py", line 1746, in _check_help
    raise ValueError('badly formed help string') from exc
ValueError: badly formed help string```

## Expected Behavior
I expected nothing to happen because this script does nothing.
This is the behavior it does in Python3.13 (which is correct).
Only in Python 3.14 it fails

## System information
- **Hydra Version** :  hydra-core-1.3.2
- **Python version** : 3.14.2
- **Virtual environment type and version** : using pyenv I create a python venv
- **Operating system** : Linux Ubuntu 22.04

## Additional context
Add any other context about the problem here.

[bashirmindee]

I think the reason is this class

It should implement an __ str__ to be compatible with the new argparse module.
Specifically this edit