chore(deps): Bump actions/setup-node in the actions-infrastructure group

Bumps the actions-infrastructure 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: actions-infrastructure
...

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

Author: dependabot[bot]

.github/workflows/validate_datasets.yml

@@ -38,7 +38,7 @@ jobs:
 
     - name: Set up Node.js
       if: matrix.bids-validator == 'legacy'
-      uses: actions/setup-node@v5
+      uses: actions/setup-node@v6
       with:
         node-version: 22