Update GitHub Action to use Node 20

.github/workflows/deploy.yml

@@ -1,24 +1,32 @@
 name: Deployment
+
 on:
   push:
     branches:
       - master
+
 jobs:
   deploy:
     runs-on: ubuntu-latest
+
     strategy:
       matrix:
-        node-version: [12.x]
+        node-version: [20.x]
+
     steps:
       - uses: actions/checkout@v1
+
       - name: Use Node.js ${{ matrix.node-version }}
         uses: actions/setup-node@v1
         with:
           node-version: ${{ matrix.node-version }}
+
       - name: Install Packages
         run: npm install
+
       - name: Build page
         run: npm run build
+
       - name: Deploy to gh-pages
         uses: peaceiris/actions-gh-pages@v3
         with: