chore(CI): use setup-node v1 for gh-pages

Author: Pyrax

.github/workflows/github-pages.yml

@@ -12,7 +12,7 @@ jobs:
       - uses: actions/checkout@v2
 
       - name: Setup Node
-        uses: actions/setup-node@v2
+        uses: actions/setup-node@v1
         with:
           node-version: '12.x'