chore: upgrade actions/setup-node to v6 in GitHub workflows

Author: sroussey

.github/workflows/test.yml

@@ -19,7 +19,7 @@ jobs:
 
     steps:
       - uses: actions/checkout@v6
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@v6
         with:
           node-version: "24"
       - uses: oven-sh/setup-bun@v2