chore(deps): update actions/setup-node action to v6

Author: renovate[bot]

.github/workflows/ci.yml

@@ -36,7 +36,7 @@ jobs:
       - uses: actions/checkout@v4
         name: checkout code 📥
       - name: setup node 🟢
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version: "20.19.5"
       - name: install dependencies 🔧