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

Author: renovate[bot]

.github/workflows/sync-ts-sdk-docs.yaml

@@ -55,7 +55,7 @@ jobs:
           path: ts-sdk
 
       - name: Set up Node.js
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version: "20"