Python tests

Bump runner Ubuntu version, while handling legacy Python versions #794

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Run time

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Job	Run time
test (3.8)	57s
test (3.9)	55s
test (3.10)	54s
test-legacy (3.5.10)	2m 37s
test (3.11)	54s
test-legacy (3.6.15)	2m 38s
test (3.12)	57s
test-legacy (3.7.10)	3m 27s
test (3.13)	53s
	14m 12s