build(workflows): update setup-node action from v5 to v6

Updated the GitHub Actions workflow files to use the newer version of the
setup-node action. This change affects both the npm-publish and pages-deploy
workflows, ensuring they use the latest available node version and maintain
compatibility with current GitHub Actions best practices.

Author: nuintun

.github/workflows/npm-publish.yml

@@ -19,7 +19,7 @@ jobs:
           version: latest
       # 设置 node
       - name: Setup node
-        uses: actions/setup-node@v5
+        uses: actions/setup-node@v6
         with:
           node-version: latest
           registry-url: https://registry.npmjs.org

.github/workflows/pages-deploy.yml

@@ -27,7 +27,7 @@ jobs:
           version: latest
       # 设置 node
       - name: Setup node
-        uses: actions/setup-node@v5
+        uses: actions/setup-node@v6
         with:
           node-version: latest
           registry-url: https://registry.npmjs.org