Update dependency vitepress to v1.6.1 (#1137)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [vitepress](https://vitepress.dev/)
([source](https://redirect.github.com/vuejs/vitepress)) | [`1.6.0` ->
`1.6.1`](https://renovatebot.com/diffs/npm/vitepress/1.6.0/1.6.1) |
[![age](https://developer.mend.io/api/mc/badges/age/npm/vitepress/1.6.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/vitepress/1.6.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/vitepress/1.6.0/1.6.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/vitepress/1.6.0/1.6.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

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

###
[`v1.6.1`](https://redirect.github.com/vuejs/vitepress/blob/HEAD/CHANGELOG.md#161-2025-01-20)

[Compare
Source](https://redirect.github.com/vuejs/vitepress/compare/v1.6.0...v1.6.1)

##### Bug Fixes

- **build:** escape `$` in replace pattern in dynamic routes plugin
([e812916](https://redirect.github.com/vuejs/vitepress/commit/e8129167c76104d59d31a77b16dff3458e6af5eb)),
closes
[#&#8203;4499](https://redirect.github.com/vuejs/vitepress/issues/4499)
- **theme/regression:** broken hero heading at certain viewports
([37dbe89](https://redirect.github.com/vuejs/vitepress/commit/37dbe895d4cf813e6eb1289f24c637945eec0d1f))

</details>

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