manifest: change manifest to track the Zephyr main branch

Current CANnectivity development version (v1.4.0-dev) tracks the Zephyr
main branch.

Signed-off-by: Henrik Brix Andersen <[email protected]>

Author: henrikbrixandersen

west.yml

@@ -8,7 +8,7 @@ manifest:
   projects:
     - name: zephyr
       remote: zephyrproject-rtos
-      revision: v4.3-branch
+      revision: main
       clone-depth: 1
       import:
         name-allowlist: