Build and test [Python 3.9, 3.10]

Use `demographics.py` from OG-Core #10

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Run time

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Job	Run time
build (ubuntu-latest, 3.9)	2m 3s
build (ubuntu-latest, 3.10)	2m 1s
build (macos-latest, 3.9)	6m 6s
build (macos-latest, 3.10)	3m 28s
	13m 38s