chore(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] <support@github.com>

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -121,7 +121,7 @@ jobs:
               - 'tools/spec-priority-audit/**'
       - name: Set up Node
         if: steps.filter.outputs.fig_converter == 'true' || steps.filter.outputs.spec_priority_audit == 'true'
-        uses: actions/setup-node@v5
+        uses: actions/setup-node@v6
         with:
           node-version: "20"
       - name: Install fig-converter dependencies