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

Author: renovate[bot]

.github/workflows/pr-checks.yaml

@@ -46,7 +46,7 @@ jobs:
     steps:
       - uses: actions/checkout@v5
       - uses: actions/setup-python@v5
-      - uses: actions/setup-node@v5
+      - uses: actions/setup-node@v6
         with:
           node-version: "24"