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

Author: renovate[bot]

.github/workflows/publish.yml

@@ -26,7 +26,7 @@ jobs:
         uses: actions/checkout@v5
 
       - name: Install Node
-        uses: actions/setup-node@v5
+        uses: actions/setup-node@v6
         with:
           node-version: "24"
 
@@ -67,7 +67,7 @@ jobs:
           ref: ${{ needs.update_hugo_npm_dependencies.outputs.commit_hash }}
 
       - name: Install Node
-        uses: actions/setup-node@v5
+        uses: actions/setup-node@v6
         with:
           node-version: "24"