[Backport v3.1] manifest: Update sdk-zephyr revision#23879

adamkondraciuk wants to merge 1 commit intonrfconnect:v3.1-branchnrfconnect/sdk-nrf:v3.1-branchfrom

adamkondraciuk:ppr_sys_clock-backportadamkondraciuk/sdk-nrf:ppr_sys_clock-backportCopy head branch name to clipboard