Downgrade version of node in github action to fix recent failures

npm/cli#7666 indicates it might be something
recent.

.github/workflows/deploy.yaml

@@ -23,7 +23,7 @@ jobs:
       - name: Use Node.js
         uses: actions/setup-node@v3
         with:
-          node-version: latest
+          node-version: 21.x
 
       - name: Build
         run: |