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

Automatically created by action-manifest-pr GH action from PR:
nrfconnect/sdk-mcuboot#664

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

Author: NordicBuilder

west.yml

@@ -127,7 +127,7 @@ manifest:
           compare-by-default: true
     - name: mcuboot
       repo-path: sdk-mcuboot
-      revision: ncs-v3.3.1-rc1
+      revision: 681c88b845a7720298e1e0e36c84d588d0f840c5
       path: bootloader/mcuboot
     - name: qcbor
       url: https://github.com/laurencelundblade/QCBOR