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

Author: renovate-bot

.github/workflows/speed-comparison.yml

@@ -152,7 +152,7 @@ jobs:
           merge-multiple: true
 
       - name: Setup Node.js
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version: '20'