manifest: mcuboot update

Synch up to the mcu-tools/mcuboot SHA:
4030aac5944e5105f45bfcb02b7e0065810a8aeb

- Switched zephyr port from using FLASH_AREA_ macros to FIXED_PARTITION_
macros
- Made flash_map_backend.h compatible with a C++ compiler
- Enabled watchdog feed by default
- Allowed to get the flash write alignment basing on the zephyr,flash
DT chosen node property

Signed-off-by: Andrzej Puzdrowski <andrzej.puzdrowski@nordicsemi.no>