use node 18 in ci

Author: mbrinkl

.github/workflows/CI.yml

@@ -12,11 +12,11 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v2
-    - name: Use Node.js 16.x
-      uses: actions/setup-node@v1
+    - uses: actions/checkout@v3
+    - name: Use Node.js 18
+      uses: actions/setup-node@v3
       with:
-        node-version: 16.x
+        node-version: 18
     - run: npm install
     - run: npm test
     - run: npm run build