Update actions/setup-node action to v6

Author: renovate[bot]

.github/workflows/main.yml

@@ -26,7 +26,7 @@ jobs:
       - name: Clone api3-dao-dashboard
         uses: actions/checkout@v4
       - name: Setup Node
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version: 16
           cache: 'yarn'
@@ -45,7 +45,7 @@ jobs:
       - name: Clone api3-dao-dashboard
         uses: actions/checkout@v4
       - name: Setup Node
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version: 16
           cache: 'yarn'