[MNT] Add support for Python 3.10

[ulupo]

Reference issues/PRs

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Description

Screenshots (if appropriate)

Any other comments?

Checklist

• [ ] I have read the guidelines for contributing.
• [ ] My code follows the code style of this project. I used flake8 to check my Python changes.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [ ] I have added tests to cover my changes.
• [ ] All new and existing tests passed. I used pytest to check this on Python tests.

[ulupo]

This can't be done until pyflagser supports 3.10, putting this on hold.

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[ulupo]

/azp run

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[ulupo]

/azp run

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[ulupo]

/azp run

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[ulupo]

/azp run

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[ulupo]

/azp run

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