Add Node.js 20.x support to lint workflow

Author: tacxou

.github/workflows/lint.yml

@@ -9,6 +9,10 @@ jobs:
   lint-app:
     runs-on: ubuntu-latest
 
+    strategy:
+      matrix:
+        node-version: [20.x]
+
     steps:
       - name: Checkout code
         uses: actions/checkout@v2