A little bug on environment wrapper

[Toni-SM]

Discussed in https://github.com/Toni-SM/skrl/discussions/70

^{Originally posted by 403forbiddennn April 19, 2023} In the Isaac Gym wrapper class, the render method is inappropriately overridden by your wrapper and thus can not render successfully. For example, the render method of IsaacGymPreview3Wrapper is:

 def render(self, *args, **kwargs) -> None:
        """Render the environment
        """
        pass

which overrides the render() in VecTask.