build(deps-dev): bump knip from 5.88.1 to 6.4.0

Bumps [knip](https://github.com/webpro-nl/knip/tree/HEAD/packages/knip) from 5.88.1 to 6.4.0.
- [Release notes](https://github.com/webpro-nl/knip/releases)
- [Commits](https://github.com/webpro-nl/knip/commits/knip@6.4.0/packages/knip)

---
updated-dependencies:
- dependency-name: knip
  dependency-version: 6.4.0
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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Author: dependabot[bot]