chore(deps): update actions/setup-node action to v6 (#8299)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/copilot-setup-steps.yml

@@ -21,7 +21,7 @@ jobs:
               uses: actions/checkout@v6
 
             - name: Set up Node.js
-              uses: actions/setup-node@v4
+              uses: actions/setup-node@v6
               with:
                   node-version-file: ".nvmrc"