Django-ical

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- Support all properties specified in RFC 5545
[magicbrothers]

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- Fix multiple CATEGORIES and add tests
[mjfinney]

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- Support for iCalendar VTODO elements
[wetneb]

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- Fix content-type charset declarations.
[lchanouha]
- Update test matrix.
Add Python 3.11 and Django 4.1 support.
Deprecate Python 3.7 support.
[aleksihakli]

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- Enable Python 3.10 and Django 4.0 support.
[aleksihakli]

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- Deprecate universal Python 2 wheels.
[aleksihakli]