chore(deps): update dependency knip to v5.21.2 (#309)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [knip](https://knip.dev)
([source](https://togithub.com/webpro-nl/knip/tree/HEAD/packages/knip))
| [`5.21.0` ->
`5.21.2`](https://renovatebot.com/diffs/npm/knip/5.21.0/5.21.2) |
[![age](https://developer.mend.io/api/mc/badges/age/npm/knip/5.21.2?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/knip/5.21.2?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/knip/5.21.0/5.21.2?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/knip/5.21.0/5.21.2?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

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

###
[`v5.21.2`](https://togithub.com/webpro-nl/knip/compare/5.21.1...bd77bcce5acfdd108ab54398c922eb03f07fc65f)

[Compare
Source](https://togithub.com/webpro-nl/knip/compare/5.21.1...5.21.2)

### [`v5.21.1`](https://togithub.com/webpro-nl/knip/releases/tag/5.21.1)

[Compare
Source](https://togithub.com/webpro-nl/knip/compare/5.21.0...5.21.1)

- Fix lockfile-lint config filename
([#&#8203;683](https://togithub.com/webpro-nl/knip/issues/683))
([`f5304b6`](https://togithub.com/webpro-nl/knip/commit/f5304b6d))
- feat: add command to ignored binaries
([#&#8203;682](https://togithub.com/webpro-nl/knip/issues/682))
([`d049b6c`](https://togithub.com/webpro-nl/knip/commit/d049b6c4))
- Add (custom) og img for sponsors page
([`d89ec12`](https://togithub.com/webpro-nl/knip/commit/d89ec129))
- Rename `NOT_FOUND` to `KNIP_ADDED` workspace names
([`3a41f8e`](https://togithub.com/webpro-nl/knip/commit/3a41f8ec))

</details>

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