manifest: Update sdk-zephyr to have clock separation Os aligned

Updated west.yml to have zephyr clock separation Os code

Signed-off-by: Michal Frankiewicz <michal.frankiewicz@nordicsemi.no>

Author: mif1-nordic

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: pull/3495/head
+      revision: pull/4399/head
       import:
         # In addition to the zephyr repository itself, NCS also
         # imports the contents of zephyr/west.yml at the above