Use newer node

Author: piroor

.github/workflows/main.yml

@@ -11,7 +11,7 @@ jobs:
     - name: setup minimum version Node.js
       uses: actions/setup-node@v1
       with:
-        node-version: '13.x'
+        node-version: '20.x'
     - uses: actions/checkout@v1
     - run: npm install
     - run: make lint