[test] デプロイ用artifactを指定

Author: kentakom1213

.github/workflows/deploy.yml

@@ -80,4 +80,6 @@ jobs:
       # Deploy the book's HTML to GitHub Pages
       - name: Deploy to GitHub Pages
         id: deployment
-        uses: actions/deploy-pages@v2
+        uses: actions/deploy-pages@v4
+        with:
+          artifact_name: github-pages