Test

tox.ini: Enable testing on Django v5.0 #611

Job	Run time
Python 3.8, Database sqlite	1m 16s
Python 3.8, Database postgres	1m 14s
Python 3.9, Database sqlite	1m 19s
Python 3.9, Database postgres	1m 17s
Python 3.10, Database sqlite	1m 57s
Python 3.10, Database postgres	1m 52s
Python 3.11, Database sqlite	1m 28s
Python 3.11, Database postgres	1m 24s
Python 3.12, Database sqlite	1m 14s
Python 3.12, Database postgres	1m 5s
Python pypy-3.9, Database sqlite	1m 53s
Python pypy-3.9, Database postgres	1m 49s
Python pypy-3.10, Database sqlite	1m 53s
Python pypy-3.10, Database postgres	1m 49s
	21m 30s

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