manifest: Update sdk-zephyr wieh nRF54L20 support

Inclues new SoC and board definitions.

Signed-off-by: Karol Lasończyk <karol.lasonczyk@nordicsemi.no>

west.yml

@@ -41,6 +41,8 @@ manifest:
       url-base: https://github.com/boschsensortec
     - name: eembc
       url-base: https://github.com/eembc
+    - name: raku
+      url-base: https://github.com/e-rk
 
   # If not otherwise specified, the projects below should be obtained
   # from the ncs remote.
@@ -72,7 +74,8 @@ manifest:
     # https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/zephyr/guides/modules.html
     - name: zephyr
       repo-path: sdk-zephyr
-      revision: a415e2d702d5192ffdf7ddf67fa73f8fab70a277
+      revision: l20-pub
+      remote: raku
       import:
         # In addition to the zephyr repository itself, NCS also
         # imports the contents of zephyr/west.yml at the above