Test

Add support for Python 3.12 #530

Job	Run time
Python 3.8 / dj32	50s
Python 3.8 / dj41	44s
Python 3.8 / dj42	52s
Python 3.9 / dj32	54s
Python 3.9 / dj41	1m 6s
Python 3.9 / dj42	57s
Python 3.10 / dj32	48s
Python 3.10 / dj41	1m 38s
Python 3.10 / dj42	48s
Python 3.11 / dj32	48s
Python 3.11 / dj41	50s
Python 3.11 / dj42	1m 4s
Python 3.12 / dj32	1m 24s
Python 3.12 / dj41	1m 18s
Python 3.12 / dj42	1m 27s
Python 3.10 / djmain	1m 2s
Python 3.11 / djmain	49s
Python 3.12 / djmain	1m 26s
Indicate completion to coveralls.io	14s
	18m 59s

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