ci: Exclude tests on macos below 28.x #357

Job	Run time
build (ubuntu-latest, 26.3, false)	3m 53s
build (ubuntu-latest, 27.2, false)	2m 31s
build (ubuntu-latest, 28.2, false)	37s
build (ubuntu-latest, 29.3, false)	4m 56s
build (macos-latest, 28.2, false)	4m 34s
build (macos-latest, 29.3, false)	4m 9s
build (windows-latest, 26.3, false)	2m 13s
build (windows-latest, 27.2, false)	55s
build (windows-latest, 28.2, false)	38s
build (windows-latest, 29.3, false)	1m 40s
build (ubuntu-latest, snapshot, true)	38s
build (macos-latest, snapshot, true)	4m 49s
	31m 33s

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