chore(deps): update dependency @astrojs/starlight to v0.28.4 (#1241)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [@astrojs/starlight](https://starlight.astro.build)
([source](https://redirect.github.com/withastro/starlight/tree/HEAD/packages/starlight))
| [`0.28.3` ->
`0.28.4`](https://renovatebot.com/diffs/npm/@astrojs%2fstarlight/0.28.3/0.28.4)
|
[![age](https://developer.mend.io/api/mc/badges/age/npm/@astrojs%2fstarlight/0.28.4?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/@astrojs%2fstarlight/0.28.4?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/@astrojs%2fstarlight/0.28.3/0.28.4?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/@astrojs%2fstarlight/0.28.3/0.28.4?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

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

###
[`v0.28.4`](https://redirect.github.com/withastro/starlight/blob/HEAD/packages/starlight/CHANGELOG.md#0284)

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

##### Patch Changes

-
[#&#8203;2444](https://redirect.github.com/withastro/starlight/pull/2444)
[`d585b3e`](https://redirect.github.com/withastro/starlight/commit/d585b3e0485dd55b2ffab985a6c06d267d22fe51)
Thanks [@&#8203;HiDeoo](https://redirect.github.com/HiDeoo)! - Fixes a
UI string translation issue for languages with a region subtag.

-
[#&#8203;2518](https://redirect.github.com/withastro/starlight/pull/2518)
[`0f69db8`](https://redirect.github.com/withastro/starlight/commit/0f69db8b806833a7160570a469ddcdc8c0dec5e0)
Thanks [@&#8203;morinokami](https://redirect.github.com/morinokami)! -
Updates Japanese UI translations

-
[#&#8203;2507](https://redirect.github.com/withastro/starlight/pull/2507)
[`bd6ced5`](https://redirect.github.com/withastro/starlight/commit/bd6ced5bc46310b217c7bfe83a0f68ba4a03da45)
Thanks [@&#8203;HiDeoo](https://redirect.github.com/HiDeoo)! - Fixes a
table of contents highlighting issue after resizing the window.

-
[#&#8203;2444](https://redirect.github.com/withastro/starlight/pull/2444)
[`d585b3e`](https://redirect.github.com/withastro/starlight/commit/d585b3e0485dd55b2ffab985a6c06d267d22fe51)
Thanks [@&#8203;HiDeoo](https://redirect.github.com/HiDeoo)! - Refactors
various components to use the new built-in localization system to access
translated UI strings.

</details>

---

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