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

Author: renovate[bot]

.github/workflows/ci.yml

@@ -17,7 +17,7 @@ jobs:
  steps:
  - uses: actions/checkout@v4
  - run: npm i -g --force corepack && corepack enable
- - uses: actions/setup-node@v4
+ - uses: actions/setup-node@v6
  with:
  node-version: 20
  cache: "pnpm"