manifest: update sdk-zephyr

Include
samples: boards: nordic: system_off: Run on nrf54l20pdk
nrfconnect/sdk-zephyr#2370
zephyrproject-rtos/zephyr#82957

Signed-off-by: Sebastian Głąb <[email protected]>

Author: nordic-segl

west.yml

@@ -69,7 +69,7 @@ manifest:
     # https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/zephyr/guides/modules.html
     - name: zephyr
       repo-path: sdk-zephyr
-      revision: 9761d261943a916443cf6c748ee3daa2915e3546
+      revision: pull/2370/head
       import:
         # In addition to the zephyr repository itself, NCS also
         # imports the contents of zephyr/west.yml at the above