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

Author: renovate[bot]

.github/workflows/docs.yml

@@ -30,7 +30,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Setup Node
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version: '20'
           cache: 'npm'