⬆️ upgrade actions/setup-node action to v6

Author: renovate[bot]

.github/workflows/checks.yml

@@ -19,7 +19,7 @@ jobs:
         uses: pnpm/action-setup@v4
 
       - name: Use Node
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version: "22.x"
           cache: "pnpm"