fix: add checkout

Signed-off-by: t-kikuc <tkikuchi07f@gmail.com>

Author: t-kikuc

.github/workflows/sync-autogen.yaml

@@ -13,6 +13,8 @@ jobs:
   sync:
     runs-on: ubuntu-24.04
     steps:
+      - name: checkout
+        uses: actions/checkout@v4
       - name: make sync
         run: make sync
       - name: git status # for logging