Use Nodejs 20 for a build

.github/workflows/gh-pages.yml

@@ -5,21 +5,16 @@ on:
   release:
     types: [published]
 
-# A workflow run is made up of one or more jobs that can run sequentially or in parallel
 jobs:
-  # This workflow contains a single job called "build"
   build:
-    # The type of runner that the job will run on
     runs-on: ubuntu-latest
 
-    # Steps represent a sequence of tasks that will be executed as part of the job
     steps:
-      # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
       - uses: actions/checkout@v2
       - name: Use Node.js
         uses: actions/setup-node@v1
         with:
-          node-version: '16.x'
+          node-version: '20.x'
       - run: npm ci
       - run: npm run build-gh-pages
       - name: Deploy