Change to Python 3.8 (#877) #713

Job	Run time
linters (3.9, ubuntu-latest)	2m 20s
Testing on Python 3.8 (ubuntu-latest)	1m 56s
Testing on Python 3.8 (macOS-latest)	4m 12s
Testing on Python 3.8 (windows-latest)	3m 36s
Testing on Python 3.9 (ubuntu-latest)	1m 54s
Testing on Python 3.9 (macOS-latest)	2m 18s
Testing on Python 3.9 (windows-latest)	2m 35s
Testing on Python 3.10 (ubuntu-latest)	1m 53s
Testing on Python 3.10 (macOS-latest)	2m 14s
Testing on Python 3.10 (windows-latest)	2m 29s
Testing on Python 3.11 (ubuntu-latest)	1m 50s
Testing on Python 3.11 (macOS-latest)	3m 0s
Testing on Python 3.11 (windows-latest)	3m 55s
	34m 12s

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