Update actions/setup-node action to v6 (#8)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/build.yaml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-24.04
     steps:
     - uses: actions/checkout@v6
-    - uses: actions/setup-node@v4
+    - uses: actions/setup-node@v6
       with:
         node-version: 24
     - run: npm ci