Merge pull request #780 from ut-issl/renovate/actions-setup-node-6.x

Update actions/setup-node action to v6

Author: 200km

.github/workflows/validate-renovate.yml

@@ -12,7 +12,7 @@ jobs:
 
     steps:
       - uses: actions/checkout@v4.2.2
-      - uses: actions/setup-node@v4.4.0
+      - uses: actions/setup-node@v6.0.0
 
       - name: install
         run: |