Add config of git credential to fix the permission issue for git clone in the updater workflow

Author: xuanyang15

.github/workflows/update-python-docs.yaml

@@ -38,6 +38,12 @@ jobs:
         with:
           credentials_json: '${{ secrets.ADK_GCP_SA_KEY }}'
 
+      - name: Configure Git Credentials
+        env:
+          PAT: ${{ secrets.ADK_BOT_GITHUB_TOKEN }}
+        run: |
+          git config --global url."https://oauth2:${PAT}@github.com/".insteadOf "https://github.com/"
+
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip