Node 20 for GitHub actions

Author: slevithan

.github/workflows/build.yml

@@ -8,10 +8,10 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - name: Use Node.js
-      uses: actions/setup-node@v1
+      uses: actions/setup-node@v4
       with:
-        node-version: '15'
+        node-version: '20'
     - run: npm install
     - run: npm test