fix(deps): update dependency rehype-slug to v6

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
rehype-slug	^5.0.1 -> ^6.0.0

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Release Notes

rehypejs/rehype-slug (rehype-slug)

v6.0.0

Compare Source

Change

• 295ac26 Update @types/hast, unified, utilities, etc migrate: update too
• 12f76f8 Change to require Node.js 16 migrate: update too
• 6855bcc Change to use exports migrate: don’t use private APIs

Full Changelog: https://github.com/rehypejs/rehype-slug/compare/5.1.0...6.0.0

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