Update dependency markdown-it-anchor to v8

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
markdown-it-anchor	5.3.0 -> 8.4.1

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Release Notes

valeriangalliat/markdown-it-anchor

v8.4.1

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• Attempt to fix npm publish that didn't publish previous version.

v8.4.0

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• Add a fix for Safari reader view in headerLink. ([#​107])

v8.3.1

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• Update TypeScript types to properly reflect the export style of
  @types/markdown-it. Also use export default anchor in type
  declaration instead of export = anchor so that TypeScript allows both
  import anchor from 'markdown-it-anchor' and import anchor = require('markdown-it-anchor')
  syntaxes instead of being forced to the latter. ([#​106])
• Added a hack to make TypeScript work with the modern import syntax
  when not being used with a bundler. ([6fcc502])

v8.3.0

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• Make core loop resilient to permalink renderers mutating the token
  stream with splice. ([#​100])

v8.2.0

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• Introduce a linkInsideHeader permalink option, which is the closest
  to the permalink in previous versions. ([#​101])
• Refactor tests using AVA.

v8.1.3

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• Fix tabIndex type. ([#​103])

v8.1.2

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• Fix prepublish script not being run on npm publish anymore.
• Update the dist code.

v8.1.1

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• Fix ReferenceError with process.emitWarning in the browser. ([#​102])

v8.1.0

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• Add token.meta.isPermalinkSymbol to help other plugins (e.g. TOC) to
  identify and ignore permalink symbols. ([#​99])

v8.0.5

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• Revert html_inline to html_block in legacy permalink. ([#​98])

v8.0.4

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• Fix level option TypeScript type. ([#​97])

v8.0.3

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• Update TypeScript types compatible with 8.0.0 release. ([#​95])

v8.0.2

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• Fix bug with linkAfterHeader permalink renderer. ([#​93])
• Also fix regression where symbol wasn't allowed to be HTML anymore
  in new renderers.

v8.0.1

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• Fix permalink option typo in readme. ([#​91])

v8.0.0

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• Set tabindex="-1" on headers. ([#​85], [#​86])
• Change the way to configure a permalink, allowing for more accessible
  choices. ([#​82], [#​89])
• Show a deprecation warning for the old permalink option.

v7.1.0

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• Update TypeScript types. ([#​83])

v7.0.2

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• Optimize token parsing. ([#​80])

v7.0.1

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• Add a Chinese readme. ([#​79])

v7.0.0

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• Depend on any markdown-it version. ([#​76])

v6.0.1

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• Added example.html test case.
• Added uniqueSlugStartIndex test case.
• Fix equal -> strictEqual.
• Updated dependencies -> found 0 vulnerabilities.

v6.0.0

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• Allow to configure unique slug start index, and make it 1 instead of 2
  to mimic what markdown-toc, github-slugger, and GitHub itself does by
  default. This should improve out of the box compatibility with other
  packages. ([#​74])

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