Bump actions/setup-node from 5 to 6 in the major group (#987)

Bumps the major group with 1 update: [actions/setup-node](https://github.com/actions/setup-node).


Updates `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
  dependency-group: major
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -50,7 +50,7 @@ jobs:
           uses: dtolnay/rust-toolchain@stable
         - uses: taiki-e/install-action@nextest
         - name: Setup node
-          uses: actions/setup-node@v5
+          uses: actions/setup-node@v6
         - name: Install openapi-changes
           run: npm i -g @pb33f/openapi-changes
         - uses: Swatinem/rust-cache@v2.8.1