os/mac/diagnostic: check for OpenCore #31213

Job	Run time
syntax	1m 9s
formula audit	4m 38s
cask audit	2m 50s
tap syntax	6m 45s
test default formula (Ubuntu 22.04)	1m 28s
test default formula (Ubuntu 20.04)	2m 45s
tests (online)	5m 0s
test default formula (macOS 13 x86_64)	4m 5s
update-test (Ubuntu)	24s
tests (generic OS)	2m 50s
test default formula (macOS 15 arm64)	1m 39s
vendored gems	35s
update-test (macOS)	27s
tests (Ubuntu 24.04)	2m 54s
tests (Ubuntu 22.04)	2m 49s
tests (Ubuntu 20.04)	3m 45s
tests (macOS 13 x86_64)	9m 13s
tests (macOS 15 arm64)	4m 54s
	58m 10s

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