manifest: Update sdk-zephyr revision

This commit updates the sdk-zephyr revision and brings
the following changes:

tests: boot: Fix bootloader.mcuboot boot loop for nrf platforms

Signed-off-by: Artur Hadasz <[email protected]>

Author: ahasztag

west.yml

@@ -65,7 +65,7 @@ manifest:
     # https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/zephyr/guides/modules.html
     - name: zephyr
       repo-path: sdk-zephyr
-      revision: 69ad0523f95f13d1de356c19575301ce3de4959e
+      revision: pull/3356/head
       import:
         # In addition to the zephyr repository itself, NCS also
         # imports the contents of zephyr/west.yml at the above