chore(deps): update actions/setup-node action to v6 (#4)

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

Author: renovate[bot]

.github/workflows/update-builtins.yml

@@ -31,7 +31,7 @@ jobs:
         run: echo "version=$(cat .node-version)" >> $GITHUB_OUTPUT
 
       - name: Setup Node.js
-        uses: actions/setup-node@0a44ba7841725637a19e28fa30b79a866c81b0a6 # v4.0.4
+        uses: actions/setup-node@395ad3262231945c25e8478fd5baf05154b1d79f # v6.1.0
         with:
           node-version: ${{ steps.node-version.outputs.version }}