manifest: update sdk-zephyr, enable WDT test on nRF5340dk

Include:
tests: drivers: watchodg: Enable wdt_error_cases on nRF5340dk
nrfconnect/sdk-zephyr#2483
zephyrproject-rtos/zephyr#85575

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

Author: nordic-segl

west.yml

@@ -70,7 +70,7 @@ manifest:
     # https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/zephyr/guides/modules.html
     - name: zephyr
       repo-path: sdk-zephyr
-      revision: bf64a318c900f2cf9b97e0df5bb813d47b398654
+      revision: 776b31e3ebc43993e2e7c2043a2bf1a5beb37815
       import:
         # In addition to the zephyr repository itself, NCS also
         # imports the contents of zephyr/west.yml at the above