Add Node.js setup step for version 24

Author: docwho2

.github/workflows/synth.yml

@@ -21,7 +21,12 @@ jobs:
         java-version: '25'
         distribution: 'corretto'
         cache: maven
-    
+
+    - name: Set up Node 24
+      uses: actions/setup-node@v6
+      with:
+        node-version: '24'
+        
     - name: Install AWS CDK
       run: |
         # Install latest version of AWS CDK