west.yml: MCUboot synchronization from upstream

Update Zephyr fork of MCUboot to revision:
  018dc01d484358d81f889c36471d9ce5590965b6

Brings following Zephyr relevant fixes:
  - 018dc01d boot/zephyr: use socs conf
  - d4394c2f mbedtls config: fix too early check_config.h
    includes

Signed-off-by: Jamie McCrae <jamie.mccrae@nordicsemi.no>