chore(deps): update dependency markdown-it-anchor to v9

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
markdown-it-anchor	^8.4.1 -> ^9.0.0

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Release Notes

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

v9.0.1

Compare Source

• Fix types following upgrade. ([#​131])

v9.0.0

Compare Source

• Support markdown-it 14. This may be breaking hence the major. ([#​129], [#​128])

v8.6.7

Compare Source

• Fix link in deprecation warning. ([#​123])

v8.6.6

Compare Source

• npm audit fix. ([#​121])

v8.6.5

Compare Source

• Support native ESM modules with TypeScript. ([#​118])

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