Bump to v2.4 #42

Job	Run time
unittests (3.7, django~=3.2, optional-deps)	51s
unittests (3.7, django~=3.2, no-optional-deps)	43s
unittests (3.8, django~=3.2, optional-deps)	41s
unittests (3.8, django~=3.2, no-optional-deps)	39s
unittests (3.8, django~=4.1, optional-deps)	42s
unittests (3.8, django~=4.1, no-optional-deps)	32s
unittests (3.8, django~=4.2, optional-deps)	51s
unittests (3.8, django~=4.2, no-optional-deps)	33s
unittests (3.9, django~=3.2, optional-deps)	41s
unittests (3.9, django~=3.2, no-optional-deps)	34s
unittests (3.9, django~=4.1, optional-deps)	44s
unittests (3.9, django~=4.1, no-optional-deps)	33s
unittests (3.9, django~=4.2, optional-deps)	48s
unittests (3.9, django~=4.2, no-optional-deps)	34s
unittests (3.10, django~=3.2, optional-deps)	42s
unittests (3.10, django~=3.2, no-optional-deps)	30s
unittests (3.10, django~=4.1, optional-deps)	45s
unittests (3.10, django~=4.1, no-optional-deps)	30s
unittests (3.10, django~=4.2, optional-deps)	39s
unittests (3.10, django~=4.2, no-optional-deps)	29s
unittests (3.11, django~=3.2, optional-deps)	40s
unittests (3.11, django~=3.2, no-optional-deps)	29s
unittests (3.11, django~=4.1, optional-deps)	51s
unittests (3.11, django~=4.1, no-optional-deps)	33s
unittests (3.11, django~=4.2, optional-deps)	40s
unittests (3.11, django~=4.2, no-optional-deps)	31s
	16m 45s

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