west.yml: MCUboot synchronization from upstream

Update Zephyr fork of MCUboot to revision:
  9fb7ce5d026db42768d63f04cc60ce022d27b555

Brings following Zephyr relevant fixes:
 - 9fb7ce5d boot: zephyr: Fix estimated size calculation
 - 7ace8bd4 zephyr: boards: Remove CONFIG_FPROTECT from nrf54l15

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