Update actions/setup-node action from v4 to v6

Author: renovate[bot]

.github/workflows/push.yml

@@ -21,7 +21,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: 'Setup Node.JS'
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version: '20.19.5'