manifest: update sdk-mcuboot

pull-in self lock RWX feature.

Signed-off-by: Mateusz Michalek <[email protected]>

Author: michalek-no

west.yml

@@ -128,7 +128,7 @@ manifest:
           compare-by-default: true
     - name: mcuboot
       repo-path: sdk-mcuboot
-      revision: c72ed153fb924203975c38dfea2853ae612e0a9a
+      revision: pull/491/head
       path: bootloader/mcuboot
     - name: qcbor
       url: https://github.com/laurencelundblade/QCBOR