feat: Upgrade Node.js version to 20.x in GitHub Actions workflow

Author: christianboer

yaml .github/workflows/main.yml

@@ -18,7 +18,7 @@ jobs:
     - name: Setup Node.js
       uses: actions/setup-node@v3
       with:
-        node-version: '16.x'
+        node-version: '20.x'
 
     - name: Install dependencies
       run: |