chore(tests): use node 22 for CI tests

Author: stainless-app[bot]

.github/workflows/ci.yml

@@ -72,7 +72,7 @@ jobs:
       - name: Set up Node
         uses: actions/setup-node@v4
         with:
-          node-version: '20'
+          node-version: '22'
 
       - name: Bootstrap
         run: ./scripts/bootstrap