Update to Zephyr 4.0.0 (#14)

And update Memfault SDK to 1.17.0

Author: noahp

west.yml

@@ -2,7 +2,7 @@ manifest:
   projects:
     - name: zephyr
       url: https://github.com/zephyrproject-rtos/zephyr
-      revision: v3.7.0
+      revision: v4.0.0
       import:
         # Limit the Zephyr modules to the required set
         name-allowlist:
@@ -13,4 +13,4 @@ manifest:
     - name: memfault-firmware-sdk
       url: https://github.com/memfault/memfault-firmware-sdk
       path: modules/lib/memfault-firmware-sdk
-      revision: 1.16.0
+      revision: 1.17.0