ci: Exclude macos tests below 27.2 #973

Job	Run time
test (ubuntu-latest, 26.3, false)	33s
test (ubuntu-latest, 27.2, false)	27s
test (ubuntu-latest, 28.2, false)	34s
test (ubuntu-latest, 29.3, false)	41s
test (macos-latest, 28.2, false)	1m 1s
test (macos-latest, 29.3, false)	1m 14s
test (windows-latest, 26.3, false)	2m 26s
test (windows-latest, 27.2, false)	1m 22s
test (windows-latest, 28.2, false)	1m 40s
test (windows-latest, 29.3, false)	1m 30s
test (ubuntu-latest, snapshot, true)	40s
test (macos-latest, snapshot, true)	1m 9s
test (windows-latest, snapshot, true)	1m 21s
	14m 38s

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