manifest: Update sdk-mcuboot revision (auto-manifest PR)

Automatically created by action-manifest-pr GH action from PR:
nrfconnect/sdk-mcuboot#704

Signed-off-by: Nordic Builder <pylon@nordicsemi.no>

Author: NordicBuilder

west.yml

@@ -129,7 +129,7 @@ manifest:
           compare-by-default: true
     - name: mcuboot
       repo-path: sdk-mcuboot
-      revision: f263a70a3d2c8f1e95c61a1eb7c1abc5ec5e3ea4
+      revision: pull/704/head
       path: bootloader/mcuboot
     - name: qcbor
       repo-path: sdk-qcbor