manifest: Regular upmerge to bring the OpenThread1.2 certification fixes.
manifest: Regular upmerge to bring the OpenThread1.2 certification fixes.

Periodic upmerge of OpenThread.

Signed-off-by: Przemyslaw Bida <a50c93f369fde5722836c96336399b0b25c1b4ec@nordicsemi.no>

finikorg/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,galak/zephyr,finikorg/zephyr,galak/zephyr,finikorg/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr