manifest: Update sdk-mcuboot revision

The update brings in enabling of encryption
with PSA+ECDSA

Signed-off-by: Artur Hadasz <artur.hadasz@nordicsemi.no>

Author: ahasztag

west.yml

@@ -128,7 +128,7 @@ manifest:
           compare-by-default: true
     - name: mcuboot
       repo-path: sdk-mcuboot
-      revision: e1f2ab3806ce7ebc7ef34b3fc04272e747590745
+      revision: pull/520/head
       path: bootloader/mcuboot
     - name: qcbor
       url: https://github.com/laurencelundblade/QCBOR