build(deps): bump actions/setup-node from 5 to 6

Bumps [actions/setup-node](https://github.com/actions/setup-node) from 5 to 6.
- [Release notes](https://github.com/actions/setup-node/releases)
- [Commits](actions/setup-node@v5...v6)

---
updated-dependencies:
- dependency-name: actions/setup-node
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -5,13 +5,13 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v5
-      - uses: actions/setup-node@v5
+      - uses: actions/setup-node@v6
       - run: npm ci
       - run: npm run lint
   # test:
   #   runs-on: ubuntu-latest
   #   steps:
   #     - uses: actions/checkout@v5
-  #     - uses: actions/setup-node@v5
+  #     - uses: actions/setup-node@v6
   #     - run: npm install
   #     - run: npm run testsuite