Bump actions/setup-node from 5 to 6 in the dependencies group (#156)

Bumps the dependencies 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: dependencies
...

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

Author: dependabot[bot]

.github/workflows/validate.yml

@@ -23,7 +23,7 @@ jobs:
         PR_NUMBER: ${{ github.event.number }}
       run: echo $PR_NUMBER > pr_number
     - name: Setup Node
-      uses: actions/setup-node@v5
+      uses: actions/setup-node@v6
       with:
         node-version: 24
     - name: Install dependencies