Support for python 3.12 datetime #207

Job	Run time
build_and_package_sanity (3.11)	1m 53s
test old stuff / Django@3.2 / Python@3.7	22m 49s
test latest / Django@-main / Python@3.8	1m 41s
test old stuff / Django@3.1 / Python@3.7	22m 39s
sanity / django_not_installed	1m 34s
test latest / Django@4.0 / Python@3.8	1m 46s
sanity / ruff	1m 24s
test old stuff / Django@3.0 / Python@3.7	22m 57s
test latest / Django@-main / Python@3.9	1m 39s
sanity / pylint	2m 21s
test old stuff / Django@2.2 / Python@3.7	23m 2s
test latest / Django@4.0 / Python@3.9	1m 43s
sanity / readme	1m 36s
test old stuff / Django@3.2 / Python@3.8	1m 47s
test latest / Django@-main / Python@3.10	2m 1s
test old stuff / Django@3.1 / Python@3.8	1m 45s
test latest / Django@4.0 / Python@3.10	1m 42s
test latest / Django@-main / Python@3.11	1m 46s
test old stuff / Django@3.0 / Python@3.8	1m 51s
test latest / Django@4.0 / Python@3.11	1m 28s
test old stuff / Django@2.2 / Python@3.8	1m 46s
test latest / Django@-main / Python@3.12	1m 55s
test old stuff / Django@3.2 / Python@3.9	1m 42s
test latest / Django@4.0 / Python@3.12	1m 50s
test old stuff / Django@3.1 / Python@3.9	1m 42s
test old stuff / Django@3.0 / Python@3.9	1m 35s
test old stuff / Django@2.2 / Python@3.9	1m 40s
	2h 11m 34s

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