manifest: Update Zephyr with cpu_load module

Add cpu_load module from upstream.

Signed-off-by: Krzysztof Chruściński <[email protected]>

Author: nordic-krch

west.yml

@@ -65,7 +65,7 @@ manifest:
     # https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/zephyr/guides/modules.html
     - name: zephyr
       repo-path: sdk-zephyr
-      revision: 83c5c72f4ca9402ad70fd33e471f3fa8a9536614
+      revision: 08fd4a2d291aaa10b75675d17b0ee6ec93250d6e
       import:
         # In addition to the zephyr repository itself, NCS also
         # imports the contents of zephyr/west.yml at the above