Update test_codepush-csh.yml

Author: kevin-cornerstone

.github/workflows/test_codepush-csh.yml

@@ -19,7 +19,7 @@ jobs:
       - name: Set up Node.js version
         uses: actions/setup-node@v3
         with:
-          node-version: '18.x'
+          node-version: '20.x'
 
       - name: npm install, build, and test
         run: |