Update dependency prettier to v3.9.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
prettier (source)	3.8.3 → 3.9.1

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Release Notes

prettier/prettier (prettier)

v3.9.1

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v3.9.0

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diff

🔗 Release Notes

v3.8.5

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v3.8.4

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Markdown: Fix blank lines between list items and nested sub-lists being removed in Markdown/MDX (#​17746 by @​byplayer)

Prettier was removing blank lines between list items and their nested sub-lists, converting loose lists into tight lists and changing their semantic meaning.

<!-- Input -->
- a

  - b

- c

  - d

<!-- Prettier 3.8.3 -->
- a
  - b
- c
  - d

<!-- Prettier 3.8.4 -->
- a

  - b

- c

  - d

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