upgrade artifact pages action

Author: Steven Chun

.github/workflows/pages.yml

@@ -31,7 +31,7 @@ jobs:
         # This points to hexo generate
         run: npm run build
       - name: Upload Pages artifact
-        uses: actions/upload-pages-artifact@v2
+        uses: actions/upload-pages-artifact@v3
         with:
           path: ./docs
   deploy: