Drop support for Django 4.1 #680

Job	Run time
Python 3.8, Database sqlite	1m 19s
Python 3.8, Database postgres	1m 13s
Python 3.9, Database sqlite	1m 17s
Python 3.9, Database postgres	1m 14s
Python 3.10, Database sqlite	2m 10s
Python 3.10, Database postgres	2m 9s
Python 3.11, Database sqlite	1m 42s
Python 3.11, Database postgres	1m 29s
Python 3.12, Database sqlite	1m 39s
Python 3.12, Database postgres	1m 26s
Python pypy-3.9, Database sqlite	3m 14s
Python pypy-3.9, Database postgres	2m 19s
Python pypy-3.10, Database sqlite	3m 8s
Python pypy-3.10, Database postgres	2m 22s
	26m 41s

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