fix(deps): update dependency @astrojs/starlight to v0.21.3 (#176)

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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))
| [`0.21.2` ->
`0.21.3`](https://renovatebot.com/diffs/npm/@astrojs%2fstarlight/0.21.2/0.21.3)
|
[![age](https://developer.mend.io/api/mc/badges/age/npm/@astrojs%2fstarlight/0.21.3?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/@astrojs%2fstarlight/0.21.3?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/@astrojs%2fstarlight/0.21.2/0.21.3?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/@astrojs%2fstarlight/0.21.2/0.21.3?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

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

###
[`v0.21.3`](https://togithub.com/withastro/starlight/blob/HEAD/packages/starlight/CHANGELOG.md#0213)

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

##### Patch Changes

- [#&#8203;1622](https://togithub.com/withastro/starlight/pull/1622)
[`3a074bad`](https://togithub.com/withastro/starlight/commit/3a074bad6c139bb9d6169d95ec79bc0fc1ecbdfe)
Thanks [@&#8203;SamuelLHuber](https://togithub.com/SamuelLHuber)! - Adds
1 new icon: `farcaster`

- [#&#8203;1616](https://togithub.com/withastro/starlight/pull/1616)
[`a86f9b71`](https://togithub.com/withastro/starlight/commit/a86f9b71b795fb6dcd0409ca568e43d25525b964)
Thanks [@&#8203;dragomano](https://togithub.com/dragomano)! - Updates
Russian UI strings

- [#&#8203;1698](https://togithub.com/withastro/starlight/pull/1698)
[`67b892fd`](https://togithub.com/withastro/starlight/commit/67b892fd5290dfd0eeb95f4e60b6427bdc82110f)
Thanks [@&#8203;liruifengv](https://togithub.com/liruifengv)! - Adds 1
new icon: `starlight`

- [#&#8203;1687](https://togithub.com/withastro/starlight/pull/1687)
[`6fa9ea7e`](https://togithub.com/withastro/starlight/commit/6fa9ea7e8d4d601cf8f49b61dafb1ebb557d1718)
Thanks [@&#8203;mingjunlu](https://togithub.com/mingjunlu)! - Translates
`fileTree.directory` UI string into Traditional Chinese.

</details>

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