Tests

Test and explicitly support Python 3.12 #2048

Job	Run time
Always - Docker verify, push to tag 'master' if on master	5m 44s
flake8	18s
black	25s
mypy	31s
3.12	7m 12s
3.11	6m 44s
3.10	7m 8s
3.9	7m 1s
3.8	6m 59s
3.7	7m 30s
PyPI - Publish if this is a tagged commit	0s
PyPI - Publish prerelease on merge commit on master	0s
Tagged - Docker push to tag based on git tag. Also push 'latest' if on master	0s
	49m 32s

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