Updated minimum supported Python and Django versions (#216) #138

Job	Run time
Visual tests	1m 15s
build (Python 3.10, Django 4.2)	1m 5s
Run tox environment quality	31s
build (Python 3.10, Django 5.0)	3m 17s
Run tox environment dist-validation	25s
build (Python 3.10, Django 5.1)	1m 9s
build (Python 3.10, Django main)	1m 43s
build (Python 3.11, Django 4.2)	3m 18s
build (Python 3.11, Django 5.0)	1m 9s
build (Python 3.11, Django 5.1)	1m 24s
build (Python 3.11, Django main)	1m 42s
build (Python 3.12, Django 4.2)	1m 20s
build (Python 3.12, Django 5.0)	3m 27s
build (Python 3.12, Django 5.1)	1m 18s
build (Python 3.12, Django main)	1m 45s
build (Python 3.8, Django 4.2)	3m 23s
build (Python 3.9, Django 4.2)	3m 18s
	31m 29s

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