Tests

Test and explicitly support Python 3.12. #2050

Job	Run time
Always - Docker verify, push to tag 'master' if on master	5m 38s
flake8	25s
black	18s
mypy	25s
3.12	7m 32s
3.11	6m 46s
3.10	7m 19s
3.9	6m 57s
3.8	7m 2s
3.7	7m 29s
PyPI - Publish prerelease on merge commit on master	0s
PyPI - Publish if this is a tagged commit	0s
Tagged - Docker push to tag based on git tag. Also push 'latest' if on master	0s
	49m 51s

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