Update Node version to 20 and upgrade GitHub Actions to v4

Author: mitsut

.devcontainer/Dockerfile

@@ -1,5 +1,5 @@
 # Update the NODE_VERSION arg in docker-compose.yml to pick a Node version: 18, 16, 14
-ARG NODE_VERSION=16
+ARG NODE_VERSION=20
 FROM mcr.microsoft.com/vscode/devcontainers/javascript-node:0-${NODE_VERSION}
 
 # VARIANT can be either 'hugo' for the standard version or 'hugo_extended' for the extended version.

.github/workflows/gh_pages.yml

@@ -23,7 +23,7 @@ jobs:
         run: hugo --minify
 
       - name: Upload build artifacts
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: public
           path: ./public
@@ -34,13 +34,13 @@ jobs:
     if: github.ref == 'refs/heads/web'
     steps:
       - name: Download build artifacts
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: public
           path: ./public
 
       - name: Deploy
-        uses: peaceiris/actions-gh-pages@v3
+        uses: peaceiris/actions-gh-pages@v4
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           publish_dir: ./public