List explicit support for Python 3.11

[hakonanes]

Description of the change

This PR adds explicit support for Python 3.11. No changes to code was necessary to support this, meaning that people are most likely already using orix on 3.11. No changes to the minimal versions of packages (diffpy.structure > 3.0.2 and matplotlib >= 3.3) are necessary.

I've also replaced our use of API tokens for publishing to PyPI and TestPyPI with the Trusted publisher approach, which uses short-lived tokens provided by GitHub instead.

Progress of the PR

• [n/a] Docstrings for all functions
• [x] Unit tests with pytest for all lines
• [n/a] Clean code style by running black via pre-commit

For reviewers

• [ ] The PR title is short, concise, and will make sense 1 year later.
• [ ] New functions are imported in corresponding __init__.py.
• [ ] New features, API changes, and deprecations are mentioned in the unreleased section in CHANGELOG.rst.
• [ ] Contributor(s) are listed correctly in __credits__ in orix/__init__.py and in .zenodo.json.

[hakonanes]

Thanks, @harripj. I can confirm that the change in authentication in the release workflow works.