Zephyr: update to include LLEXT logging protection

Zephyr PR 77289 fixed deferred logging with LLEXT objects, update to
a Zephyr version, containing it.

Signed-off-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>

west.yml

@@ -43,7 +43,7 @@ manifest:
 
     - name: zephyr
       repo-path: zephyr
-      revision: 795ac34f291c2f9895e7a3a03eafc053ad1d36f2
+      revision: 494f88070f6bb909389630264e4f89c71072ae53
       remote: zephyrproject
 
       # Import some projects listed in zephyr/west.yml@revision