manifest: Update sdk-zephyr

Include:
tests: drivers: counter: Enable test execution on nRF54L20pdk
nrfconnect/sdk-zephyr#2378
zephyrproject-rtos/zephyr#82968

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: 2c7f6efa7220ef2fbdd70e8597aedf1a07e86067
+      revision: pull/2378/head
       import:
         # In addition to the zephyr repository itself, NCS also
         # imports the contents of zephyr/west.yml at the above