ci: specify node 18 for npm publish workflow

Author: abbesBenayache

.github/workflows/sdk-npm-publish.yml

@@ -23,6 +23,8 @@ jobs:
 
       - name: Set up Node.js
         uses: actions/setup-node@v4
+        with:
+          node-version: '20'
 
       - name: Set publish version
         id: set-publish-version