Build and test [Python 3.9, 3.10, 3.11]

Extensions to `demographics.py` #820

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Run time

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Job	Run time
build (ubuntu-latest, 3.9)	21m 12s
build (ubuntu-latest, 3.10)	22m 0s
build (ubuntu-latest, 3.11)	22m 25s
build (macos-latest, 3.9)	32m 51s
build (macos-latest, 3.10)	36m 38s
build (macos-latest, 3.11)	45m 25s
build (windows-latest, 3.9)	30m 58s
build (windows-latest, 3.10)	35m 21s
build (windows-latest, 3.11)	34m 57s
	4h 41m 47s