Update actions/setup-node action to v6 (#237)

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

Author: renovate[bot]

.github/workflows/build.yml

@@ -9,7 +9,7 @@ jobs:
     steps:
     - uses: actions/checkout@v5
     - name: Set Node.js 20.x
-      uses: actions/setup-node@v5
+      uses: actions/setup-node@v6
       with:
         node-version: 20.x
     - name: "Install"