chore(deps): update dependency @astrojs/starlight to v0.31.1 (#928)

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))
| [`0.31.0` ->
`0.31.1`](https://renovatebot.com/diffs/npm/@astrojs%2fstarlight/0.31.0/0.31.1)
|
[![age](https://developer.mend.io/api/mc/badges/age/npm/@astrojs%2fstarlight/0.31.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/@astrojs%2fstarlight/0.31.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/@astrojs%2fstarlight/0.31.0/0.31.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/@astrojs%2fstarlight/0.31.0/0.31.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

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

###
[`v0.31.1`](https://redirect.github.com/withastro/starlight/blob/HEAD/packages/starlight/CHANGELOG.md#0311)

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

##### Patch Changes

-
[#&#8203;2805](https://redirect.github.com/withastro/starlight/pull/2805)
[`ed6f9fd`](https://redirect.github.com/withastro/starlight/commit/ed6f9fd77334c02a75240087d0800ef32f159583)
Thanks [@&#8203;HiDeoo](https://redirect.github.com/HiDeoo)! - Exposes
the
[`StarlightIcon`](https://starlight.astro.build/reference/icons/#starlighticon-type)
TypeScript type referencing the names of Starlight’s built-in icons.

</details>

---

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