Disable Zephyr in CI

Author: rauhul

.github/workflows/build-zephyr.yml

@@ -3,8 +3,6 @@ name: Zephyr
 on:
   push:
     branches: ["main"]
-  pull_request:
-    types: [opened, reopened, synchronize, ready_for_review]
 
 jobs:
   build:

nrfx-blink-sdk/west.yml

@@ -9,5 +9,5 @@ manifest:
       revision: main
       import:
         name-allowlist:
-          - cmsis_6  # required by the ARM port
+          - cmsis  # required by the ARM port
           - hal_nordic  # required by the custom_plank board (Nordic based)