[embedded] Build the macOS Embedded Stdlib with a recent deployment target #72716
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The macOS embedded stdlib, which is mostly used for testing (we run CI against it in ci.swift.org) and for experimentation/prototyping, is currently building with deployment target of macOS 10.13 (same as the regular stdlib). Given that the embedded stdlib is not meant for back-deploying to older OS's, let's bump it to 14 to simplify our testing story and allow embedded tests to take advantage of OS version gated features (this will enable us to test more Swift Concurrency).