manifest: Update sdk-zephyr revision

Manifest update to have idle-with-cache-retained PM state.

Signed-off-by: Adam Kondraciuk <[email protected]>

Author: adamkondraciuk

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: bbfecc3539562c83c6116e7adaa7501c6d1d8d51
+      revision: pull/3249/head
       import:
         # In addition to the zephyr repository itself, NCS also
         # imports the contents of zephyr/west.yml at the above