chore(deps): update dependency knip to v5.39.4 (#379)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [knip](https://knip.dev)
([source](https://redirect.github.com/webpro-nl/knip/tree/HEAD/packages/knip))
| [`5.39.2` ->
`5.39.4`](https://renovatebot.com/diffs/npm/knip/5.39.2/5.39.4) |
[![age](https://developer.mend.io/api/mc/badges/age/npm/knip/5.39.4?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/knip/5.39.4?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/knip/5.39.2/5.39.4?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/knip/5.39.2/5.39.4?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>webpro-nl/knip (knip)</summary>

###
[`v5.39.4`](https://redirect.github.com/webpro-nl/knip/compare/5.39.3...df390a0debba08ac705e86e0b42eaefe098d1812)

[Compare
Source](https://redirect.github.com/webpro-nl/knip/compare/5.39.3...5.39.4)

###
[`v5.39.3`](https://redirect.github.com/webpro-nl/knip/releases/tag/5.39.3)

[Compare
Source](https://redirect.github.com/webpro-nl/knip/compare/5.39.2...5.39.3)

- Doc edits
([`0f640e1`](https://redirect.github.com/webpro-nl/knip/commit/0f640e1e))
- feat: update mdx detection dependency list and update custom compiler…
([#&#8203;875](https://redirect.github.com/webpro-nl/knip/issues/875))
([`055a2e3`](https://redirect.github.com/webpro-nl/knip/commit/055a2e38))
- Add new content configuration entry for Astro
([#&#8203;872](https://redirect.github.com/webpro-nl/knip/issues/872))
([`c80ac0e`](https://redirect.github.com/webpro-nl/knip/commit/c80ac0e7))

</details>

---

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