manifest: update mcuboot reference

This is needed to include changes from zephyrproject-rtos/mcuboot#124.

Signed-off-by: Valerio Setti <[email protected]>

Author: valeriosetti

west.yml

@@ -303,7 +303,7 @@ manifest:
       groups:
         - crypto
     - name: mcuboot
-      revision: 346f7374ff4467e40b5594658f8ac67a5e9813c9
+      revision: pull/124/head
       path: bootloader/mcuboot
       groups:
         - bootloader