Pin Xcode to 16.4 and default macOS runner to macos-15#488

ar9708 merged 1 commit intoOwnTube-tv:mainOwnTube-tv/web-client:mainfrom

mblomdahl:fix/pin-xcode-16.4-and-macos-15-runnermblomdahl/web-client:fix/pin-xcode-16.4-and-macos-15-runnerCopy head branch name to clipboard