Test package

Add `Python 3.13` and `Django 5.1` support and drop `Python 3.8`, `Py… #495

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Run time

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Job	Run time
prepare	9s
lint	35s
test (3.10, 4.0)	39s
test (3.10, 4.1)	37s
test (3.10, 4.2)	34s
test (3.10, 5.0)	39s
test (3.10, 5.1)	35s
test (3.11, 4.1)	40s
test (3.11, 4.2)	29s
test (3.11, 5.0)	35s
test (3.11, 5.1)	31s
test (3.12, 4.2)	39s
test (3.12, 5.0)	47s
test (3.12, 5.1)	35s
test (3.13, 5.1)	49s
	8m 53s