Drop support for Django 4.1 #671

Job	Run time
Python 3.8, Database sqlite	1m 6s
Python 3.8, Database postgres	1m 5s
Python 3.9, Database sqlite	1m 2s
Python 3.9, Database postgres	59s
Python 3.10, Database sqlite	1m 47s
Python 3.10, Database postgres	1m 46s
Python 3.11, Database sqlite	1m 14s
Python 3.11, Database postgres	1m 17s
Python 3.12, Database sqlite	1m 23s
Python 3.12, Database postgres	1m 22s
Python pypy-3.9, Database sqlite	1m 44s
Python pypy-3.9, Database postgres	1m 16s
Python pypy-3.10, Database sqlite	1m 49s
Python pypy-3.10, Database postgres	1m 26s
	19m 16s

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