Update actions/setup-node action to v6

Author: renovate[bot]

.github/workflows/ci.yml

@@ -27,7 +27,7 @@ jobs:
       - name: Checkout 🛎
         uses: actions/checkout@v4
       - name: Setup Node env 🏗
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version: 'lts/*'
           cache: 'npm'