os/mac/diagnostic: fix OpenCore check #31220

Job	Run time
syntax	43s
tap syntax	6m 25s
cask audit	2m 33s
formula audit	4m 30s
tests (online)	7m 42s
update-test (Ubuntu)	29s
vendored gems	39s
tests (generic OS)	3m 0s
update-test (macOS)	22s
tests (Ubuntu 24.04)	3m 5s
tests (Ubuntu 22.04)	3m 9s
tests (Ubuntu 20.04)	3m 55s
test default formula (Ubuntu 22.04)	1m 26s
tests (macOS 13 x86_64)	9m 2s
test default formula (Ubuntu 20.04)	3m 36s
test default formula (macOS 13 x86_64)	5m 50s
test default formula (macOS 15 arm64)	1m 20s
tests (macOS 15 arm64)	4m 54s
	1h 2m 40s

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