Update Node.js version to 20 in workflow

Author: yashrajchudasama26

.github/workflows/main.yml

@@ -27,7 +27,7 @@ jobs:
     - name: Setup Node.js
       uses: actions/setup-node@v4
       with:
-        node-version: '18'
+        node-version: '20'
         cache: 'npm'
         cache-dependency-path: 'Boxology-Interface/package-lock.json'