manifest: update openthread
manifest: update openthread

Update the openthread repository to enable OT_ASSERT based on
CONFIG_ASSERT.

Signed-off-by: Pieter De Gendt <b5b50e3ea5dc0014327690ec78e146f3b45ee870@basalte.be>

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