Bump GH actions deps

.github/workflows/lint.yml

@@ -15,7 +15,7 @@ jobs:
       - name: Setup Node
         uses: actions/setup-node@v4
         with:
-          node-version: '18'
+          node-version: '20'
 
       - name: Lint
         run: npm ci && npx eslint .

.github/workflows/pages.yml

@@ -20,13 +20,13 @@ jobs:
       - name: Setup Node
         uses: actions/setup-node@v4
         with:
-          node-version: '18'
+          node-version: '20'
 
       - name: Build
         run: npm ci && npm run lint && npm run build:github
 
       - name: Deploy
-        uses: peaceiris/actions-gh-pages@v3
+        uses: peaceiris/actions-gh-pages@v4
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           publish_dir: ./dist