We're now using 20241216.479 (https://github.com/actions/runner-images/blob/main/images/macos/macos-13-Readme.md). 15 is now available in preview (https://github.com/actions/runner-images/blob/main/images/macos/macos-15-Readme.md) and Sequoia is currently latest.