Update dependency knip to ^6.21.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence	Diffend	Pending
knip (source)	^6.18.0 → ^6.21.0					Diff	6.24.0 (+2)

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Release Notes

webpro-nl/knip (knip)

v6.21.0: Release 6.21.0

Compare Source

• Detect Vite config dependencies (resolve #​1721) (8754c43)
• fix: Update timerifyMethods to include resolveFromAST (#​1814) (3c8deac) - thanks @​gwagjiug!
• Fix crash on null root export in package.json (resolve #​1815) (9b8af2b)
• Fix unresolved subpath imports with a colon prefix (resolve #​1816) (f89db41)
• Detect Next.js entry files in subdirectory (resolve #​1817) (f32c6ea)

v6.20.0: Release 6.20.0

Compare Source

• Add raw transfer opt-out (resolve #​1813) (6f08c68)
• Fix cached plugin config cycles (resolve #​1811) (2bc2f24)

v6.19.0: Release 6.19.0

Compare Source

• feat: support new optional sveltekit config pattern via vite config (#​1810) (3fee8bf) - thanks @​fubits1!
• Optimize hot path string scanning (e30cfe7)
• Update astro snapshot (71e71a7)

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