Update actions/setup-node action to v6

Author: renovate[bot]

.github/workflows/test.yaml

@@ -15,7 +15,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@v6
         with:
           node-version: '18.x'