[Infra] Update messaging workflow to use macOS 15 for Xcode 16 #14089
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Updated the
messagingworkflow to usemacos-15for Xcode 16 jobs. Previouslypod-lib-lintwas skipping the Xcode 16 tests because of the multi-matrix+includeapproach (they should have been failing since Xcode 16 is no longer available in themacos-14runner images).Also upgraded from Xcode 16.0 to Xcode 16.1 since it is now available (note: the Xcode 16.1 RC has the same build number,
16B40, as the final version and is symlinked as Xcode_16.1 in the runner images).#no-changelog