Update actions

Author: fregante

.github/workflows/demo.yml

@@ -15,15 +15,15 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - run: npm ci
       - run: npm run build:demo
       - run: npm run test:demo
       - run: grep -rq "/fregante/" ./demo/dist
         # https://github.com/refined-github/github-url-detection/pull/161
         name: Ensure that the demo is built correctly
       - name: Upload artifact
-        uses: actions/upload-pages-artifact@v1
+        uses: actions/upload-pages-artifact@v3
         with:
           path: demo/dist/
 
@@ -42,4 +42,4 @@ jobs:
     steps:
       - name: Deploy to GitHub Pages
         id: deployment
-        uses: actions/deploy-pages@v1
+        uses: actions/deploy-pages@v4