update GitHub App token configuration in action.yml

Author: starkris51

action.yml

@@ -56,8 +56,8 @@ runs:
       id: app-token
       uses: actions/create-github-app-token@v2
       with:
-        app_id: ${{ secrets.APP_ID }}
-        private_key: ${{ secrets.PRIVATE_KEY }}
+        app_id: ${{ vars.DEVELOPER_DOCS_APP_ID }}
+        private_key: ${{ secrets.DEVELOPER_DOCS_APP_KEY }}
 
     - name: Check out base repository
       uses: actions/checkout@v5