Test

Add support for Python 3.12 #592

Job	Run time
Python 3.7, Database sqlite	1m 1s
Python 3.7, Database postgres	57s
Python 3.8, Database sqlite	1m 46s
Python 3.8, Database postgres	1m 29s
Python 3.9, Database sqlite	2m 3s
Python 3.9, Database postgres	1m 50s
Python 3.10, Database sqlite	2m 17s
Python 3.10, Database postgres	2m 2s
Python 3.11, Database sqlite	1m 36s
Python 3.11, Database postgres	1m 27s
Python 3.12, Database sqlite	59s
Python 3.12, Database postgres	57s
Python pypy-3.7, Database sqlite	1m 24s
Python pypy-3.7, Database postgres	1m 45s
Python pypy-3.8, Database sqlite	2m 48s
Python pypy-3.8, Database postgres	2m 1s
Python pypy-3.9, Database sqlite	2m 58s
Python pypy-3.9, Database postgres	1m 58s
	31m 18s

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