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

Author: renovate[bot]

.github/workflows/update-hugo-dependencies.yml

@@ -14,7 +14,7 @@ jobs:
         uses: actions/checkout@v5
 
       - name: Install Node
-        uses: actions/setup-node@v5
+        uses: actions/setup-node@v6
         with:
           node-version: "24"