CI: add Node.js 20

Author: XhmikosR

.github/workflows/node.js.yml

@@ -14,7 +14,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        node-version: [12, 14, 16, 18]
+        node-version: [12, 14, 16, 18, 20]
 
     steps:
       - uses: actions/checkout@v3