Updated to non-deprecated CI/CD actions.

Author: oubiwann

.github/workflows/deploy-site.yml

@@ -41,7 +41,7 @@ jobs:
       - name: Build content and regen CSS
         run: make cicd-build
       - name: Upload artifact
-        uses: actions/upload-pages-artifact@v2
+        uses: actions/upload-pages-artifact@v4
         with:
           path: ./site
 
@@ -55,4 +55,4 @@ jobs:
     steps:
       - name: Deploy to GitHub Pages
         id: deployment
-        uses: actions/deploy-pages@v2
+        uses: actions/deploy-pages@v4