Add 20.x to the CI

Author: raszi

.github/workflows/node.js.yml

@@ -14,7 +14,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [14.x, 16.x, 18.x]
+        node-version: [14.x, 16.x, 18.x, 20.x]
         os: [ubuntu-latest, windows-latest]
         # See supported Node.js release schedule at https://nodejs.org/en/about/releases/