chore(deps): update dependency knip to v5.9.1 (#420)

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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/knip/tree/HEAD/packages/knip)) |
[`5.9.0` -> `5.9.1`](https://renovatebot.com/diffs/npm/knip/5.9.0/5.9.1)
|
[![age](https://developer.mend.io/api/mc/badges/age/npm/knip/5.9.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/knip/5.9.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/knip/5.9.0/5.9.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/knip/5.9.0/5.9.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

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

### [`v5.9.1`](https://togithub.com/webpro/knip/releases/tag/5.9.1)

[Compare Source](https://togithub.com/webpro/knip/compare/5.9.0...5.9.1)

- Update a few dependencies
([`fc63105`](https://togithub.com/webpro/knip/commit/fc631055))
- Ignore whitespace-only lines from `.gitignore` files (close
[#&#8203;589](https://togithub.com/webpro/knip/issues/589))
([`202ed86`](https://togithub.com/webpro/knip/commit/202ed86a))
- Imply --production if --strict
([`f915b91`](https://togithub.com/webpro/knip/commit/f915b91b))
- Update docs
([#&#8203;583](https://togithub.com/webpro/knip/issues/583))
([`e64e6ad`](https://togithub.com/webpro/knip/commit/e64e6ad7))

</details>

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