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ci(docker.yml): Omit impossible macos tests #908

Job	Run time
test (ubuntu-latest, 26.3, false)	30s
test (ubuntu-latest, 27.2, false)	42s
test (ubuntu-latest, 28.2, false)	35s
test (ubuntu-latest, 29.4, false)	1m 2s
test (macos-latest, 28.2, false)	1m 14s
test (macos-latest, 29.4, false)	1m 24s
test (windows-latest, 26.3, false)	2m 19s
test (windows-latest, 27.2, false)	2m 21s
test (windows-latest, 28.2, false)	1m 30s
test (windows-latest, 29.4, false)	1m 17s
test (ubuntu-latest, snapshot, true)	26s
test (macos-latest, snapshot, true)	1m 7s
test (windows-latest, snapshot, true)	1m 28s
	15m 55s

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