Likepep403

PyPI entry for this package: https://pypi.org/project/likepep403/2.0.0/

It's no longer compatible with Python 3.11 or earlier versions. This only contains syntax changes, but bumps the major version number due to lack of compatibility with previous Python versions.

This package though does not contain any new features. For Python 3.11 or earlier, you can still install version 1.0.3, which is the only earlier version that's available on PyPI.

Release notes
- Adapted to [PEP 695](https://peps.python.org/pep-0695/) type parameter syntax by removing procedurally created type variables.

- Fixed `decor.py` failing because of removing `from __future__ import annotations`.

This is the first release of `likepep403` that got it to the PyPI. You can see it [here](https://pypi.org/project/likepep403/1.0.3/).

Release notes

- Made `MissingType` instances slotted with an empty tuple, making them unable to have any attributes.