gh-140189: Use macos-14 runner for iOS CI tests #142444
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We're currently seeing a 2-4% failure rate in iOS tests.
This appears to be caused by a problem with the GitHub Actions macos-15 environment; this environment has been having performance issues since August (see actions/runner-images#12777).
This PR reverts to the
macos-14runner, which apparently isn't subject to the issues themacos-15runner is experiencing. This means we'll be running iOS tests on an older iOS release (Xcode 15.4, iOS 17.5); but since we're compiling with iOS 13 compatibility, this shouldn't impact anything.