manifest: update sdk-zephyr

Include
samples: subsys: settings: Enable test on nrf54L20 PDK
nrfconnect/sdk-zephyr#2402
zephyrproject-rtos/zephyr#86479
(zephyrproject-rtos/zephyr#83165)

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

Author: nordic-segl

west.yml

@@ -66,7 +66,7 @@ manifest:
     # https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/zephyr/guides/modules.html
     - name: zephyr
       repo-path: sdk-zephyr
-      revision: 499557232f6b6a57df80c951fb2b33f9e36af4e4
+      revision: 9476b04c64cb5975f67b6b8eddc8ef0a4e9bd10c
       import:
         # In addition to the zephyr repository itself, NCS also
         # imports the contents of zephyr/west.yml at the above