Use merged mainline version of formatting

Author: Skptak

.github/workflows/ci.yml

@@ -169,7 +169,7 @@ jobs:
     steps:
       - uses: actions/checkout@v3
       - name: Check formatting
-        uses: FreeRTOS/CI-CD-Github-Actions/formatting@v2
+        uses: FreeRTOS/CI-CD-Github-Actions/formatting@main
         with:
           path: ./
           exclude-dirs: .git