Build and test [Python 3.9, 3.10]

Use `demographics.py` from OG-Core #9

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Run time

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Job	Run time
build (ubuntu-latest, 3.9)	2m 4s
build (ubuntu-latest, 3.10)	2m 9s
build (macos-latest, 3.9)	3m 32s
build (macos-latest, 3.10)	3m 49s
	11m 34s