chore: 🤖 update dependency knip to v5.6.1

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
knip (source)	5.6.0 -> 5.6.1

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Release Notes

webpro/knip (knip)

### [`v5.6.1`](https://togithub.com/webpro/knip/releases/tag/5.6.1) [Compare Source](https://togithub.com/webpro/knip/compare/5.6.0...5.6.1) - Fix recursive tsconfig extends retrieval (resolves [#​574](https://togithub.com/webpro/knip/issues/574)) ([`78f6a78`](https://togithub.com/webpro/knip/commit/78f6a785)) - Don't return `null` for vitest environment (fixes [#​575](https://togithub.com/webpro/knip/issues/575)) ([`473d7ab`](https://togithub.com/webpro/knip/commit/473d7abb))

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Configuration

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🚦 Automerge: Enabled.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

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