ci: update actions/setup-node to v6

Author: stklcode

.github/workflows/test.yml

@@ -53,7 +53,7 @@ jobs:
           php-version: '8.2'
           tools: composer
       - name: Setup Node
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version: '22'
       - name: Install