Update dependency markdown-it to v14

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
markdown-it	13.0.2 -> 14.0.0

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Release Notes

markdown-it/markdown-it (markdown-it)

v14.0.0

Compare Source

Changed

• Drop ancient browsers support (use .fromCodePoint and other features).
• Rewrite to ESM (including all plugins/deps). CJS fallback still available.
  No signatures changed, except markdown-it-emoji plugin.
• Dropped dist/ folder from repo, build on package publish.
• Set punicode.js as external dependency.

Fixed

• Html tokens inside img alt are now rendered as their original text, #​896.
• Hardbreaks inside img alt are now rendered as newlines.

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Configuration

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🔬 pa11y-ci results

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