[ci] Update actions/setup-node action to v6

Author: lpinca

.github/workflows/ci.yml

@@ -17,7 +17,7 @@ jobs:
           - windows-latest
     steps:
       - uses: actions/checkout@v5
-      - uses: actions/setup-node@v5
+      - uses: actions/setup-node@v6
         with:
           node-version: 24
       - run: npm ci