manifest: sdk-zephyr: Bump nrf regtool v8.1.2 ncs#20204

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

NordicBuilder:auto-manifest-sdk-zephyr-2467NordicBuilder/sdk-nrf:auto-manifest-sdk-zephyr-2467Copy head branch name to clipboard