Typing-extensions as dependency for py3.9 #4907

Job	Run time
validate-dependency-specification	10s
install-with-pip	22s
install-with-conda (3.9, true)	49s
install-with-pip ([atomic_tools,docs,notebook,rest,tests,tui])	1m 21s
install-with-conda (3.10, true)	52s
install-with-conda (3.11, true)	52s
install-with-conda (3.12, true)	1m 4s
install-with-conda (false)	56s
create-conda-environment	0s
tests (3.9)	9m 6s
tests (3.10)	9m 8s
tests (3.11)	9m 7s
tests (3.12)	9m 11s
	42m 58s

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