feat: upgrade CI Node.js version to 20 (#13)

Author: liewstar

.github/workflows/ci.yml

@@ -37,7 +37,7 @@ jobs:
       - name: Set up Node.js
         uses: actions/setup-node@v2
         with:
-          node-version: 18
+          node-version: 20
 
       - name: Sematic Release
         run: |