Add Python 3.12 to test matrix #401

Job	Run time
Test macOS (macos-latest, 3.10)	9m 30s
Test Windows (windows-latest, 3.10)	8m 26s
Build sdist and wheels	41s
Test macOS (macos-latest, 3.11)	8m 18s
Test Windows (windows-latest, 3.11)	11m 9s
Test ubuntu-22.04 with Python 3.9	5m 57s
Test macOS (macos-latest, 3.12-dev)	9m 55s
Test Windows (windows-latest, 3.12-dev)	13m 28s
Test ubuntu-22.04 with Python 3.10	6m 6s
Test ubuntu-22.04 with Python 3.11	6m 27s
Test ubuntu-22.04 with Python 3.9	6m 20s
Test ubuntu-latest with Python 3.12-dev	11m 55s
Build Docker images	12m 15s
Create GitHub release	0s
Deploy artifacts to PyPI	0s
	1h 50m 27s

Provide feedback