fix(ci): pin pnpm to 11.12.0 to avoid 11.13.0 install regression

[lzxue]

问题

最近所有基于 master 的新 PR，CI 的 lint / unit-test / size-test 三个 job 都在 install 阶段 ~10s 内失败：

[ERROR] Cannot use 'in' operator to search for 'integrity' in undefined
For help, run: pnpm help install
##[error]Process completed with exit code 1.

复现 PR（与各自代码改动无关，均在 install 阶段崩）：

• chore: remove dead code in maps & legacy build #2874（纯删 10 个死文件）
• refactor(maps): migrate gmap & tdtmap adapters to BaseMap #2875（仅改 2 个 map.ts）

根因

.github/actions/prepare-install/action.yml 用浮动版本：

- uses: pnpm/action-setup@v3
  with:
    version: 11      # 解析到最新 11.x = 11.13.0

version: 11 近期解析到新发布的 pnpm 11.13.0，它与当前 lockfile（由 pnpm@11.12.0 生成）不兼容，在 pnpm install 解析 lockfile 时崩溃。

对照证据：更早的 PR（#2863 / #2856 / #2853 等）跑 lint (20.x) 全 pass、耗时 2 分钟+（真正跑了测试）——彼时 11.x 还解析到 11.12.0/更早版本；近期 11.13.0 发布后才 regression。

修复

固定为 11.12.0，与 package.json 的 packageManager: "pnpm@11.12.0" 一致：

-        version: 11
+        version: 11.12.0

验证

本 PR 的 CI 会用固定后的 11.12.0 运行 —— 若 install 通过、lint/unit/size 正常跑起来，即验证修复。

说明

• action-setup@v3 本身可读 packageManager 字段，但仅在未显式传 version 时。当前 action 显式传了 version: 11 会覆盖，故需显式 pin。
• 合并后，依赖此基线的 PR（chore: remove dead code in maps & legacy build #2874 / refactor(maps): migrate gmap & tdtmap adapters to BaseMap #2875 等）重跑 CI 即可变绿。

[changeset-bot]

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[gemini-code-assist]

Code Review

This pull request updates the pnpm version to 11.12.0 in the prepare-install GitHub action. The reviewer suggested removing the explicit version parameter entirely to leverage pnpm/action-setup's ability to automatically read the version from package.json, thereby avoiding duplicate maintenance of the version number.

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[gemini-code-assist]

由于 package.json 中已经声明了 "packageManager": "pnpm@11.12.0"，且 pnpm/action-setup 在未显式指定 version 时会自动读取并使用 package.json 中的 packageManager 字段。为了避免在多个地方重复维护 pnpm 的版本号（遵循单一数据源原则），建议直接移除 version 参数和 with 块。这样后续升级 pnpm 时，只需在 package.json 中进行修改即可。

    - uses: pnpm/action-setup@v3