add token to agoraio/docs checkout in workflow

.github/workflows/test-site.yml

@@ -24,6 +24,7 @@ jobs:
         uses: actions/checkout@v3
         with:
           repository: AgoraIO/Docs
+          token: ${{ secrets.GH_PAT }}
       - uses: actions/setup-node@v3
       - name: Checkout submodules 🫄
         run: git submodule update --init --recursive