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

Author: renovate[bot]

.github/workflows/ci.yaml

@@ -16,7 +16,7 @@ jobs:
       - uses: actions/checkout@v5
 
       - name: Use Node.js ${{ matrix.node-version }}
-        uses: actions/setup-node@v5
+        uses: actions/setup-node@v6
 
       - uses: pnpm/action-setup@v4.2.0
         name: Install pnpm