Try macOS parallel testing again #298

Job	Run time
Build & Test (archlinux)	3m 33s
Build & Test (centos-7)	12m 7s
Build & Test (centos-stream-8)	12m 30s
Build & Test (centos-stream-9)	12m 23s
Build & Test (debian-11)	2m 53s
Build & Test (debian-12)	2m 49s
Build & Test (fedora-38)	5m 32s
Build & Test (fedora-39)	2m 57s
Build & Test (opensuse-leap-15)	11m 23s
Build & Test (ubuntu-20.04)	3m 11s
Build & Test (ubuntu-22.04)	2m 36s
Build & Test (debian-unstable)	13s
Build & Test (debian-unstable-autotools)	51s
Build & Test (fedora-rawhide)	2m 27s
Build & Test (opensuse-tumbleweed)	11m 34s
Build & Test (ubuntu-devel)	3m 1s
Build & Test (ubuntu-devel-autotools)	4m 3s
	1h 34m 3s

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