List explicit support for Python 3.11 and remove for 3.6

[hakonanes]

Description of the change

Same procedures as for https://github.com/pyxem/orix/pull/455.

Removed support for Python 3.6 because >= 3.7 should be enough. Had to bump oldest SciPy from 1.0 to 1.1 for Python 3.7.

Progress of the PR

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

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 diffsims/release_info.py and in .zenodo.json.

[hakonanes]

Thanks!