Add python 3.12 tox environment #4105

Job	Run time
install-with-conda (3.9, true)	1m 7s
install-with-conda (3.10, true)	1m 5s
install-with-conda (3.11, true)	1m 4s
install-with-conda (3.12, true)	1m 11s
install-with-pip	27s
install-with-pip ([atomic_tools,docs,notebook,rest,tests,tui])	1m 38s
validate-dependency-specification	8s
install-with-conda (false)	1m 6s
create-conda-environment	55s
resolve-pip-dependencies (3.9)	1m 32s
resolve-pip-dependencies (3.10)	1m 28s
resolve-pip-dependencies (3.11)	1m 24s
resolve-pip-dependencies (3.12)	2m 34s
tests (3.9)	22m 38s
tests (3.10)	21m 54s
tests (3.11)	21m 31s
tests (3.12)	27m 36s
check-requirements	8s
	1h 49m 26s

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