Test

Add support for Python 3.12 #590

Job	Run time
Python 3.7, Database sqlite	1m 0s
Python 3.7, Database postgres	54s
Python 3.8, Database sqlite	1m 30s
Python 3.8, Database postgres	1m 38s
Python 3.9, Database sqlite	1m 49s
Python 3.9, Database postgres	1m 32s
Python 3.10, Database sqlite	2m 29s
Python 3.10, Database postgres	2m 32s
Python 3.11, Database sqlite	1m 54s
Python 3.11, Database postgres	1m 28s
Python 3.12, Database sqlite	1m 1s
Python 3.12, Database postgres	57s
Python pypy-3.7, Database sqlite	2m 6s
Python pypy-3.7, Database postgres	1m 21s
Python pypy-3.8, Database sqlite	2m 24s
Python pypy-3.8, Database postgres	1m 58s
Python pypy-3.9, Database sqlite	2m 5s
Python pypy-3.9, Database postgres	1m 56s
	30m 34s

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