Python tests

Update actions/checkout action to v6 #169

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Run time

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Job	Run time
test (3.9, ubuntu-latest)	14s
test (3.13, ubuntu-latest)	16s
test (3.12, ubuntu-latest)	14s
test (3.10, ubuntu-latest)	18s
test (3.11, ubuntu-latest)	18s
failure-notification	0s
	1m 20s