fix: github workflows' python versions #779

Job	Run time
build (ubuntu-22.04, 3.7, 8.1)	45s
build (ubuntu-22.04, 3.13, 8.2)	8m 0s
build (ubuntu-22.04, 3.9, 8.2)	7m 57s
fossa-scan / Run fossa scan on repository	36s
build (ubuntu-22.04, 3.13, 8.1)	7m 56s
build (ubuntu-22.04, 3.7, latest)	1m 5s
build (ubuntu-22.04, 3.7, 8.2)	46s
build (ubuntu-22.04, 3.13, latest)	11m 40s
build (ubuntu-22.04, 3.9, 8.1)	8m 1s
build (ubuntu-22.04, 3.9, latest)	11m 34s
fossa-scan / Fetch fossa results	2m 29s
	1h 0m 49s

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