Bump actions/setup-node from 5 to 6 in /actions/setup_environment (#25)

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

Author: dependabot[bot]

actions/setup_environment/action.yaml

@@ -36,7 +36,7 @@ runs:
       run: go install cuelang.org/go/cmd/cue@${{  inputs.cue_version }}
       shell: bash
     - name: Install nodejs
-      uses: actions/setup-node@v5
+      uses: actions/setup-node@v6
       if: inputs.enable_npm == 'true'
       with:
         node-version-file: ${{ inputs.nvmrc_path }}