Update actions/setup-node action to v6

Author: renovate[bot]

.github/workflows/static.yml

@@ -31,7 +31,7 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
       - name: Setup Node
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version: 24
           cache: npm # or pnpm / yarn