manifest: Update sdk-zephyr wieh nRF54L20 support

Inclues new SoC and board definitions.

Signed-off-by: Karol Lasończyk <[email protected]>

Author: kl-cruz

west.yml

@@ -63,7 +63,7 @@ manifest:
     # https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/zephyr/guides/modules.html
     - name: zephyr
       repo-path: sdk-zephyr
-      revision: 4c996ecd07e576524a98405b2af6c01c56cb83e5
+      revision: pull/1917/head
       import:
         # In addition to the zephyr repository itself, NCS also
         # imports the contents of zephyr/west.yml at the above