fix(ci): release 工作流升级到 Node 22

[email protected] 要求 engines node ^22.18.0 || >=24。CI 此前用 Node 20，
tsdown 加载 tsdown.config.ts 时回退到可选依赖 unrun（未安装）而报错
"Failed to import module 'unrun'"。升级到 Node 22.x 后 tsdown 原生
导入 TS 配置，无需 unrun。本地 v22.22 一直正常即此原因。

Co-Authored-By: Claude Opus 4.8 <[email protected]>

Author: edram

.github/workflows/release.yml

@@ -18,10 +18,10 @@ jobs:
       - name: Setup pnpm
         uses: pnpm/action-setup@v4
 
-      - name: Setup Node.js 20.x
+      - name: Setup Node.js 22.x
         uses: actions/setup-node@v4
         with:
-          node-version: 20.x
+          node-version: 22.x
 
       - name: Install Dependencies
         run: pnpm i