Update passive_env_checker.py with np.bool_ instead of np.bool8

[jblackiex]

passive_envchecker.py:233: DeprecationWarning: np.bool8 is a deprecated alias for `np.bool`. (Deprecated NumPy 1.24)

Description

passive_envchecker.py:233: DeprecationWarning: np.bool8 is a deprecated alias for `np.bool`. (Deprecated NumPy 1.24). I replaced all occurences of np.bool8 with np.bool_ inside passive_env_checker.py.

Fixes # (Deprecated Package)

Type of change

Please delete options that are not relevant.

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update

Screenshots

Please attach before and after screenshots of the change if applicable.

Checklist:

• [ ] I have run the pre-commit checks with pre-commit run --all-files (see CONTRIBUTING.md instructions to set it up)
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] New and existing unit tests pass locally with my changes

[pseudo-rnd-thoughts]

Gym is not longer maintained, see Gymnasium which has already fixed this