manifest: Update sdk-zephyr revision

Update sdk-zephyr revision to revert noup changes
for ram_context_for_isr test.

Signed-off-by: Anton Zyma <anton.zyma@nordicsemi.no>

Author: AntonZma

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: 54cb011dfd3a09ea6a4e87d06493f95fb7b27e8a
+      revision: 83612f5380c2dd83bcf3a29633b41d39e6543873
       import:
         # In addition to the zephyr repository itself, NCS also
         # imports the contents of zephyr/west.yml at the above