west.yml: MCUboot synchronization from upstream

Update Zephyr fork of MCUboot to revision:
  5d6471bac184c8accaeeb0efcfad8dd35225a28d

Brings following Zephyr relevant fixes:
  - 5d6471ba zephyr: convert platform_allow to a list
  - 7cc60059 boot: zephyr: boards: nrf54l10 and nrf54l05 configs
  - 742978e7 boot: zephyr: Fix
    sample.bootloader.mcuboot.usb_cdc_acm_recovery
  - 39aab3d8 zephyr: Add CONFIG_MCUBOOT_CLEANUP_RAM

Signed-off-by: Jamie McCrae <[email protected]>

Author: nordicjm

west.yml

@@ -291,7 +291,7 @@ manifest:
       groups:
         - crypto
     - name: mcuboot
-      revision: eb942067989569f9cf319b087d0bb16b16effd86
+      revision: 5d6471bac184c8accaeeb0efcfad8dd35225a28d
       path: bootloader/mcuboot
       groups:
         - bootloader