Update dependency typedoc to v0.28.9 (#1350)

This PR contains the following updates:

| Package | Change | Age | Confidence |
|---|---|---|---|
| [typedoc](https://typedoc.org)
([source](https://redirect.github.com/TypeStrong/TypeDoc)) | [`0.28.8`
-> `0.28.9`](https://renovatebot.com/diffs/npm/typedoc/0.28.8/0.28.9) |
[![age](https://developer.mend.io/api/mc/badges/age/npm/typedoc/0.28.9?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/typedoc/0.28.8/0.28.9?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>TypeStrong/TypeDoc (typedoc)</summary>

###
[`v0.28.9`](https://redirect.github.com/TypeStrong/TypeDoc/blob/HEAD/CHANGELOG.md#v0289-2025-08-01)

[Compare
Source](https://redirect.github.com/TypeStrong/TypeDoc/compare/v0.28.8...v0.28.9)

##### Features

- Add support for TypeScript 5.9,
[#&#8203;2989](https://redirect.github.com/TypeStrong/TypeDoc/issues/2989).

##### Bug Fixes

- Fixed bug introduced in 0.28.8 where TypeDoc could not render docs
when members inherited from a complex type alias,
[#&#8203;2982](https://redirect.github.com/TypeStrong/TypeDoc/issues/2982).
- Fixed automatic discovery of entry points when not running in packages
mode,
[#&#8203;2988](https://redirect.github.com/TypeStrong/TypeDoc/issues/2988).
- Fixed discovery of package.json file when running with entry points
containing a glob,
[#&#8203;2985](https://redirect.github.com/TypeStrong/TypeDoc/issues/2985).

</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/line/line-bot-sdk-nodejs).

<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0MS40Ni4zIiwidXBkYXRlZEluVmVyIjoiNDEuNDYuMyIsInRhcmdldEJyYW5jaCI6Im1hc3RlciIsImxhYmVscyI6WyJkZXBlbmRlbmN5IHVwZ3JhZGUiXX0=-->

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]