chore: use node 18.x to build react-contoso (#2752)

Author: gavinbarron

.github/workflows/pr-chat.yml

@@ -13,7 +13,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [16.x]
+        node-version: [18.x]
 
     steps:
       - uses: actions/checkout@v4