west.yaml: MCUboot synchronization from upstream cherry-picks

Cherry-pick some MCUboot updates to Zephyr 3.4-branch.

Brings following Zephyr relevant fixes:

 - 865f1d0 boot_serial: fix image number handle in image upload
           request
 - fb2ff1d boot_serial: fix misuse of 'matched' param from
           zcbor_map_decode_bulk()
 - 7c2cfe6 boot_serial: Fix showing images that are not valid

Signed-off-by: Jamie McCrae <jamie.mccrae@nordicsemi.no>