Fix: Update GitHub Actions artifact and deploy actions to v4

Author: chaoming

.github/workflows/hugo.yml

@@ -64,7 +64,7 @@ jobs:
         working-directory: ${{ github.workspace }}
 
       - name: Upload artifact
-        uses: actions/upload-pages-artifact@v2
+        uses: actions/upload-pages-artifact@v4
         with:
           path: ${{ github.workspace }}/public
 
@@ -77,4 +77,4 @@ jobs:
     steps:
       - name: Deploy to GitHub Pages
         id: deployment
-        uses: actions/deploy-pages@v2
+        uses: actions/deploy-pages@v4