Build and test [Python 3.9, 3.10, 3.11]

Allow `chi_n` parameter to vary over the time path #789

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Run time

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Job	Run time
build (ubuntu-latest, 3.9)	2m 8s
build (ubuntu-latest, 3.10)	2m 9s
build (ubuntu-latest, 3.11)	2m 25s
build (macos-latest, 3.9)	2m 8s
build (macos-latest, 3.10)	2m 6s
build (macos-latest, 3.11)	2m 6s
build (windows-latest, 3.9)	2m 11s
build (windows-latest, 3.10)	2m 11s
build (windows-latest, 3.11)	2m 11s
	19m 35s