Remove node warnings from workflows

- Use setup-node to control Node version used to build
- Use Node20 compatible actions in custom actions

.github/workflows/ci-verify-outputs.yml

@@ -17,6 +17,9 @@ jobs:
     steps:
     - name: Checkout sources
       uses: actions/checkout@v4
+    - uses: actions/setup-node@v4
+      with:
+        node-version: 20
     - name: Build
       run: |
         npm -v