Fix Python 3.14 compatibility in config_store.py

[ddelgadovargas-cyber]

I got this error in Python3.14:

test/test_config_store.py:24: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
config_store.py:262: in to_dataclass
    annotation = map_annotation(annotation, mapping=MAPPING)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

annotation = float | torch.Tensor | str
mapping = {<class 'torch.nn.modules.module.Module'>: typing.Any, <class 'torch.Tensor'>: typing.Any}

    def map_annotation(
        annotation: Any,
        mapping: Optional[Dict[Any, Any]] = None,
    ) -> Any:
        origin = getattr(annotation, '__origin__', None)
        args: Tuple[Any, ...] = getattr(annotation, '__args__', tuple())
        if origin in {Union, list, dict, tuple}:
            assert origin is not None
            args = tuple(map_annotation(a, mapping) for a in args)
            if type(annotation).__name__ == 'GenericAlias':
                # If annotated with `list[...]` or `dict[...]`:
                annotation = origin[args]
            else:
                # If annotated with `typing.List[...]` or `typing.Dict[...]`:
                annotation = copy.copy(annotation)
>               annotation.__args__ = args
E               AttributeError: readonly attribute

config_store.py:176: AttributeError

In Python 3.14, the __args__ attribute of generic aliases (like typing.Dict) is read-only. The original code attempted to copy the annotation and mutate __args__. This change replaced this logic to use origin[args] directly, which is the standard way to construct these types in modern Python.