chore: update dependency knip to v6

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
knip (source)	^5.82.1 → ^6.0.0

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Release Notes

webpro-nl/knip (knip)

v6.0.1: Release 6.0.1

Compare Source

• Update sponsors (0659240)
• Handle computed access in local refs visitor (b998bab)

v6.0.0: Release 6.0.0

Compare Source

Blog post: Announcing Knip v6

See the pre-releases for details:

• https://github.com/webpro-nl/knip/releases/tag/knip%406.0.0-0
• https://github.com/webpro-nl/knip/releases/tag/knip%406.0.0-1
• https://github.com/webpro-nl/knip/releases/tag/knip%406.0.0-2
• https://github.com/webpro-nl/knip/releases/tag/knip%406.0.0-3

Breaking changes:

• Dropped support for Node.js v18 → Knip v6 requires Node.js v20.19.0 or newer
• Dropped issue type classMembers
• Dropped --include-libs → this is now the default and only behavior
• Dropped --isolate-workspaces → this is now the default and only behavior
• Dropped --experimental-tags → use --tags
• In reporter functions, issues.files is consistent with other issue shapes. Removed issues._files.
• In the JSON reporter, issues are consistently arrays for any issue type. Removed root files.

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[lumirlumir]

LGTM.

Looking at the changelog for knip v6, there are no breaking changes that affect us, so I'll merge it.

https://knip.dev/blog/knip-v6#breaking-changes