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In 0547e573c555, I introduced backdeployment testing on macOS using Github-provided builders. This was done by basically building libc++ on a slightly older macOS (like macOS 13) and then running against the system library on that machine. However, that created a dependency that libc++ must keep working on macOS 13, which doesn't support the latest-released Xcode. This patch solves that problem by moving the deployment testing to a newer version of macOS which supports the latest-released version of Xcode. Sadly, that also reduces the backdeployment coverage we have since we're not actually testing on older OSes, but is necessary to satisfy the documented libc++ support policy. In the future, we could improve the situation by providing a Lit configuration that allows compiling (but not running) all the tests, building the tests on a supported macOS, and then shipping those tests on an older backdeployment target in order to run them against the system library. Since that requires significant engineering, this isn't done at this time.