Update dependency tsup to v5.12.8

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
tsup	5.12.7 -> 5.12.8

---

Release Notes

egoist/tsup

### [`v5.12.8`](https://togithub.com/egoist/tsup/releases/v5.12.8) [Compare Source](https://togithub.com/egoist/tsup/compare/v5.12.7...v5.12.8) ##### Bug Fixes - update `source-map` to 0.8.0-beta.0, closes [#​623](https://togithub.com/egoist/tsup/issues/623) ([c67e03d](https://togithub.com/egoist/tsup/commit/c67e03debc3bc536508fda6fb8839f7895572021))

---

Configuration

📅 Schedule: At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

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

---

• [ ] If you want to rebase/retry this PR, click this checkbox.

---

This PR has been generated by WhiteSource Renovate. View repository job log here.