Update dependency vitepress to v1.6.3 (#1144)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [vitepress](https://vitepress.dev/)
([source](https://redirect.github.com/vuejs/vitepress)) | [`1.6.2` ->
`1.6.3`](https://renovatebot.com/diffs/npm/vitepress/1.6.2/1.6.3) |
[![age](https://developer.mend.io/api/mc/badges/age/npm/vitepress/1.6.3?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/vitepress/1.6.3?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/vitepress/1.6.2/1.6.3?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/vitepress/1.6.2/1.6.3?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>vuejs/vitepress (vitepress)</summary>

###
[`v1.6.3`](https://redirect.github.com/vuejs/vitepress/blob/HEAD/CHANGELOG.md#163-2025-01-22)

[Compare
Source](https://redirect.github.com/vuejs/vitepress/compare/v1.6.2...v1.6.3)

##### Bug Fixes

- docsearch not rendering properly
([3e4120e](https://redirect.github.com/vuejs/vitepress/commit/3e4120e94805156bf63587fd633162433dbaf260))

</details>

---

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---

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