Bump actions/deploy-pages from 3 to 4 (#13)

Author: dependabot[bot]

.github/workflows/github-pages.yml

@@ -46,4 +46,4 @@ jobs:
     steps:
       - name: Deploy to GitHub Pages
         id: deployment
-        uses: actions/deploy-pages@v3
+        uses: actions/deploy-pages@v4