manifest: Update zephyr to v4.3.0

Update to v4.3.0 release of the Zephyr main tree.

Signed-off-by: Martin Hoff <martin.hoff@silabs.com>

Author: Martinhoff-maker

west.yml

@@ -19,7 +19,7 @@ manifest:
       path: bootloader/mcuboot
     - name: zephyr
       remote: silabs
-      revision: 91b1b84eee8159ce9706e8e0a3826cea04a09170
+      revision: 3568e1b6d5cdd51a6b964a2a1d6d29200fea2056
       import:
         # By using name-allowlist we can clone only the modules that are
         # strictly needed by the application.