run units target on OpenBSD

GitHub Actions: change s390x/ubuntu:latest to s390x/ubuntu:23.04 due to s390x/ubuntu:latest is not available recently #130

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Run time

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Job	Run time
testing (7.5)	2m 34s
testing (7.4)	2m 35s
testing (7.3)	2m 26s
testing (7.2)	2m 36s
	10m 11s