Python tests

Bump runner Ubuntu version, while handling legacy Python versions #810

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Run time

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Job	Run time
test-legacy (3.5.10)	55s
test (3.8)	1m 1s
test-legacy (3.6.15)	1m 3s
test (3.9)	54s
test-legacy (3.7.10)	53s
test (3.10)	55s
test (3.11)	1m 2s
test (3.12)	1m 2s
test (3.13)	57s
	8m 42s