.github: fix OS version for galexie CI #4458

Job	Run time
Integration tests (ubuntu-20.04, 1.21, 12, 21)	57m 38s
Test (and push) verify-range image	2m 27s
Integration tests (ubuntu-20.04, 1.21, 12, 22)	58m 9s
Integration tests (ubuntu-20.04, 1.21, 16, 21)	57m 49s
Integration tests (ubuntu-20.04, 1.21, 16, 22)	58m 3s
Integration tests (ubuntu-20.04, 1.22, 12, 21)	56m 41s
Integration tests (ubuntu-20.04, 1.22, 12, 22)	57m 38s
Integration tests (ubuntu-20.04, 1.22, 16, 21)	57m 5s
Integration tests (ubuntu-20.04, 1.22, 16, 22)	58m 10s
Integration tests (ubuntu-22.04, 1.21, 12, 21)	54m 12s
Integration tests (ubuntu-22.04, 1.21, 12, 22)	50m 54s
Integration tests (ubuntu-22.04, 1.21, 16, 21)	57m 30s
Integration tests (ubuntu-22.04, 1.21, 16, 22)	57m 15s
Integration tests (ubuntu-22.04, 1.22, 12, 21)	51m 15s
Integration tests (ubuntu-22.04, 1.22, 12, 22)	52m 12s
Integration tests (ubuntu-22.04, 1.22, 16, 21)	57m 31s
Integration tests (ubuntu-22.04, 1.22, 16, 22)	58m 51s
	15h 3m 20s

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