MacOS/iOS/tvOS build

GitHub Actions: use macOS-26 runner; bump Diligent actions to v12 #1081

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Run time

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Job	Run time
MacOS -> Pre-Checks	12s
MacOS -> MacOS-Debug	6m 32s
MacOS -> MacOS-Release	8m 42s
MacOS -> tvOS-Debug	2m 20s
MacOS -> iOS-Debug	3m 49s
MacOS -> iOS-Release	3m 42s
	25m 17s