ci: bump actions/setup-node to v6

Author: 3alpha

.github/workflows/main.yml

@@ -15,7 +15,7 @@ jobs:
     if: github.event_name == 'push' || github.event_name == 'workflow_dispatch'
     steps:
       - uses: actions/checkout@v7
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@v6
         with:
           node-version: "24"
       - name: Publish