[nrf fromlist] manifest: openthread: Regular OpenThread upmerge#2054

nordicjm merged 2 commits intonrfconnect:mainnrfconnect/sdk-zephyr:mainfrom

maciejbaczmanski:ot_frame_counter_ahead_ncsmaciejbaczmanski/sdk-zephyr:ot_frame_counter_ahead_ncsCopy head branch name to clipboard