chore(deps): update dependency tsdown to v0.16.6 (#15895)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [tsdown](http://tsdown.dev/) ([source](https://redirect.github.com/rolldown/tsdown)) | [`0.16.5` -> `0.16.6`](https://renovatebot.com/diffs/npm/tsdown/0.16.5/0.16.6) | [![age](https://developer.mend.io/api/mc/badges/age/npm/tsdown/0.16.6?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/tsdown/0.16.6?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/tsdown/0.16.5/0.16.6?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/tsdown/0.16.5/0.16.6?slim=true)](https://docs.renovatebot.com/merge-confidence/) |

---

### Release Notes

<details>
<summary>rolldown/tsdown (tsdown)</summary>

### [`v0.16.6`](https://redirect.github.com/rolldown/tsdown/releases/tag/v0.16.6)

[Compare Source](https://redirect.github.com/rolldown/tsdown/compare/v0.16.5...v0.16.6)

#####    🚀 Features

- Upgrade rolldown to beta 51  -  by [@&#8203;sxzz](https://redirect.github.com/sxzz) [<samp>(f502b)</samp>](https://redirect.github.com/rolldown/tsdown/commit/f502bc1)

#####     [View changes on GitHub](https://redirect.github.com/rolldown/tsdown/compare/v0.16.5...v0.16.6)

</details>

---

### Configuration

📅 **Schedule**: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 **Automerge**: Enabled.

♻ **Rebasing**: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update again.

---

 - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box

---

This PR was generated by [Mend Renovate](https://mend.io/renovate/). View the [repository job log](https://developer.mend.io/github/oxc-project/oxc).
<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0Mi4xNi4xIiwidXBkYXRlZEluVmVyIjoiNDIuMTYuMSIsInRhcmdldEJyYW5jaCI6Im1haW4iLCJsYWJlbHMiOltdfQ==-->

Author: renovate[bot]