Update dependency github-slugger to v2

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
github-slugger	1.5.0 -> 2.0.0

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Release Notes

Flet/github-slugger (github-slugger)

v2.0.0

Compare Source

• Use ESM
  breaking: please read this guide
• Add types
  breaking: tiny chance of breaking, use a new version of TS and it’ll work

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Configuration

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♻ 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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• If you want to rebase/retry this PR, check this box

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