Test

tox.ini: Enable testing on Django v5.0 #605

Job	Run time
Python 3.8, Database sqlite	1m 10s
Python 3.8, Database postgres	1m 8s
Python 3.9, Database sqlite	1m 11s
Python 3.9, Database postgres	1m 10s
Python 3.10, Database sqlite	1m 54s
Python 3.10, Database postgres	1m 52s
Python 3.11, Database sqlite	1m 28s
Python 3.11, Database postgres	1m 21s
Python 3.12, Database sqlite	1m 2s
Python 3.12, Database postgres	1m 10s
Python pypy-3.8, Database sqlite	1m 57s
Python pypy-3.8, Database postgres	1m 51s
Python pypy-3.9, Database sqlite	1m 58s
Python pypy-3.9, Database postgres	2m 1s
	21m 13s

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