Add tests and wheel for Python 3.12 #91

Job	Run time
Test on ubuntu-20.04 w/ Py3.8	1m 48s
Test on macos-latest w/ Py3.8	1m 43s
Test on ubuntu-20.04 w/ Py3.9	2m 0s
Test on macos-latest w/ Py3.9	1m 13s
Test on ubuntu-20.04 w/ Py3.10	1m 48s
Test on macos-latest w/ Py3.10	1m 8s
Test on ubuntu-20.04 w/ Py3.11	1m 37s
Test on macos-latest w/ Py3.11	1m 21s
Test on ubuntu-20.04 w/ Py3.12	1m 44s
Test on macos-latest w/ Py3.12	1m 11s
Build wheels on Ubuntu	13m 35s
Test sdist on MacOS w/ Py3.8	2m 4s
Test sdist on MacOS w/ Py3.12	1m 29s
Test manylinux wheel on Ubuntu w/ Py3.12	2m 9s
Deploy artefacts to testpypi	0s
Deploy sdist to pypi	0s
	34m 50s

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