Update action versions

Author: TheoWinterhalter

.github/workflows/webpage.yaml

@@ -47,10 +47,10 @@ jobs:
         uses: actions/configure-pages@v3
       - name: Upload artifact
         if: github.ref_name == github.event.repository.default_branch
-        uses: actions/upload-pages-artifact@v1
+        uses: actions/upload-pages-artifact@v3
         with:
           path: 'website'
       - name: Deploy to GitHub Pages
         if: github.ref_name == github.event.repository.default_branch
         id: deployment
-        uses: actions/deploy-pages@v1
+        uses: actions/deploy-pages@v4