manifest: update zephyr to bring in nrf21540 timing fix#22136

rlubos merged 2 commits intonrfconnect:mainnrfconnect/sdk-nrf:mainfrom

ankuns:nrf21540_fix_default_tx_en_settle_time_cpankuns/sdk-nrf:nrf21540_fix_default_tx_en_settle_time_cpCopy head branch name to clipboard