Update dependency typedoc to v0.26.9 (#1000)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [typedoc](https://typedoc.org)
([source](https://redirect.github.com/TypeStrong/TypeDoc)) | [`0.26.8`
-> `0.26.9`](https://renovatebot.com/diffs/npm/typedoc/0.26.8/0.26.9) |
[![age](https://developer.mend.io/api/mc/badges/age/npm/typedoc/0.26.9?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/typedoc/0.26.9?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/typedoc/0.26.8/0.26.9?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/typedoc/0.26.8/0.26.9?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

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

###
[`v0.26.9`](https://redirect.github.com/TypeStrong/TypeDoc/blob/HEAD/CHANGELOG.md#v0269-2024-10-11)

[Compare
Source](https://redirect.github.com/TypeStrong/TypeDoc/compare/v0.26.8...v0.26.9)

##### Features

- Added `headings` option to control optional headings,
[#&#8203;2729](https://redirect.github.com/TypeStrong/TypeDoc/issues/2729).
- Updated Chinese translations,
[#&#8203;2739](https://redirect.github.com/TypeStrong/TypeDoc/issues/2739).
- Added a folder icon to page navigation elements which are not links,
[#&#8203;2741](https://redirect.github.com/TypeStrong/TypeDoc/issues/2741).

##### Bug Fixes

- `externalSymbolLinkMappings` now uses the TypeScript reported link
target if available,
[#&#8203;2725](https://redirect.github.com/TypeStrong/TypeDoc/issues/2725).
- TypeDoc will no longer omit the modules page if a project contains
only modules/documents,
[#&#8203;2730](https://redirect.github.com/TypeStrong/TypeDoc/issues/2730).
- Fixed missing breadcrumbs on project page,
[#&#8203;2728](https://redirect.github.com/TypeStrong/TypeDoc/issues/2728).
- TypeDoc will no longer render an empty readme page if no readme was
found.

##### Thanks!

-   [@&#8203;lriggle-strib](https://redirect.github.com/lriggle-strib)
-   [@&#8203;mrfigg](https://redirect.github.com/mrfigg)
-   [@&#8203;XeroAlpha](https://redirect.github.com/XeroAlpha)

</details>

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