Build and test [Python 3.9, 3.10, 3.11]

Extensions to `demographics.py` #822

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Run time

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Job	Run time
build (ubuntu-latest, 3.9)	20m 53s
build (ubuntu-latest, 3.10)	20m 14s
build (ubuntu-latest, 3.11)	18m 58s
build (macos-latest, 3.9)	26m 58s
build (macos-latest, 3.10)	32m 46s
build (macos-latest, 3.11)	31m 38s
build (windows-latest, 3.9)	32m 18s
build (windows-latest, 3.10)	34m 38s
build (windows-latest, 3.11)	34m 44s
	4h 13m 7s