ci/macos: macOS 14 -> macOS 15 #39648
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This change switches the macOS CI job from MacOS 14 to MacOS 15.
macOS 14 (sonoma) came out in Sept '23 and hit github actions in Jan 2024: https://github.blog/changelog/2024-01-30-github-actions-macos-14-sonoma-is-now-available/
macOS 15 (sequoia) came out in Sept '24 and hit github actions in April 2025: https://github.blog/changelog/2025-04-10-github-actions-macos-15-and-windows-2025-images-are-now-generally-available/
It would be great to run CI on the more recent macOS as many developers have now updated to the latest OS version.