Update actions/setup-node action to v6

Author: renovate[bot]

.github/workflows/web-checks.yml

@@ -35,7 +35,7 @@ jobs:
     steps:
       - uses: actions/checkout@v5
       - name: Use Node.js 20.14.0
-        uses: actions/setup-node@v5
+        uses: actions/setup-node@v6
         with:
           node-version: "22.20.0"
           cache: "npm"