workflow: specifies the version of action

Author: hujiulong

.github/workflows/update-examples.yml

@@ -13,7 +13,7 @@ jobs:
       - uses: actions/setup-node@v1
         with:
           node-version: 12
-      - uses: JamesIves/github-pages-deploy-action@master
+      - uses: JamesIves/github-pages-deploy-action@4.1.4
         env:
           ACCESS_TOKEN: ${{ secrets.ACCESS_TOKEN }}
           BASE_BRANCH: master