manifest: Update to latest sdk-zephyr version

Brings in latest sdk-zephyr updates including
host channel classification fix.

Signed-off-by: Sean Madigan <sean.madigan@nordicsemi.no>

west.yml

@@ -61,7 +61,7 @@ manifest:
     # https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/zephyr/guides/modules.html
     - name: zephyr
       repo-path: sdk-zephyr
-      revision: 617f2d3fc477a6e11863e2edae3f98b4e4ba533e
+      revision: ff855dc9516a0a02341165379ba86f2ddc17447d
       import:
         # In addition to the zephyr repository itself, NCS also
         # imports the contents of zephyr/west.yml at the above