manifest: sdk-zephyr: ci: workflow: update macOS runner from macos-13 to macos-15#24936

NordicBuilder wants to merge 1 commit intonrfconnect:mainnrfconnect/sdk-nrf:mainfrom

NordicBuilder:auto-manifest-sdk-zephyr-3376NordicBuilder/sdk-nrf:auto-manifest-sdk-zephyr-3376Copy head branch name to clipboard