chore(deps): update actions/setup-node action to v6

Author: renovate[bot]

.github/workflows/pr-check.yml

@@ -46,7 +46,7 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v6
       - name: Set up Node.js
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version: '20'
           cache: 'npm'