fix(deps): update dependency @astrojs/starlight to v0.21.1 (#148)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [@astrojs/starlight](https://starlight.astro.build)
([source](https://togithub.com/withastro/starlight/tree/HEAD/packages/starlight))
| [`0.21.0` ->
`0.21.1`](https://renovatebot.com/diffs/npm/@astrojs%2fstarlight/0.21.0/0.21.1)
|
[![age](https://developer.mend.io/api/mc/badges/age/npm/@astrojs%2fstarlight/0.21.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/@astrojs%2fstarlight/0.21.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/@astrojs%2fstarlight/0.21.0/0.21.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
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|

---

### Release Notes

<details>
<summary>withastro/starlight (@&#8203;astrojs/starlight)</summary>

###
[`v0.21.1`](https://togithub.com/withastro/starlight/blob/HEAD/packages/starlight/CHANGELOG.md#0211)

[Compare
Source](https://togithub.com/withastro/starlight/compare/@astrojs/[email protected]...@astrojs/[email protected])

##### Patch Changes

- [#&#8203;1584](https://togithub.com/withastro/starlight/pull/1584)
[`8851d5cd`](https://togithub.com/withastro/starlight/commit/8851d5cd0d8f8439320ef729ca57a59418db52b9)
Thanks [@&#8203;HiDeoo](https://togithub.com/HiDeoo)! - Adds 2 new
icons: `apple` and `linux`.

- [#&#8203;1577](https://togithub.com/withastro/starlight/pull/1577)
[`0ba77890`](https://togithub.com/withastro/starlight/commit/0ba77890e0dcf54a849c735efd870327c10972aa)
Thanks [@&#8203;morinokami](https://togithub.com/morinokami)! -
Translates `fileTree.directory` UI string into Japanese.

- [#&#8203;1593](https://togithub.com/withastro/starlight/pull/1593)
[`fa7ed245`](https://togithub.com/withastro/starlight/commit/fa7ed2458caf6261d16c5f43365cedbcb8572a48)
Thanks [@&#8203;liruifengv](https://togithub.com/liruifengv)! -
Translates `fileTree.directory` UI string into simplified Chinese.

- [#&#8203;1585](https://togithub.com/withastro/starlight/pull/1585)
[`bd4e278f`](https://togithub.com/withastro/starlight/commit/bd4e278f7fe7d7335494602db29a63002fd45059)
Thanks [@&#8203;HiDeoo](https://togithub.com/HiDeoo)! - Translates
`fileTree.directory` UI string into French.

- [#&#8203;1587](https://togithub.com/withastro/starlight/pull/1587)
[`c5794260`](https://togithub.com/withastro/starlight/commit/c5794260251ed414a396089782a1788539c92dd3)
Thanks [@&#8203;Eveeifyeve](https://togithub.com/Eveeifyeve)! - Adds 1
new icon: `homebrew`.

</details>

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