Update dependency markdown-it-anchor to v10

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
markdown-it-anchor	^9.2.0 → ^10.0.0

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Release Notes

valeriangalliat/markdown-it-anchor (markdown-it-anchor)

v10.0.0

Compare Source

• Add a failOnNonUnique option to suffix duplicate explicit IDs
  instead of throwing. ([#​139], [#​140])
• Expose used slugs on env.markdownItAnchor.slugs for other plugins.
  Breaking: the same env reused across render calls now shares
  uniqueness. Pass a new env (or omit it) per document to keep the old
  isolation. Reuse env when several Markdown sources make up one HTML
  page. ([#​139], [#​140])

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