meta: bump prettier from 3.8.3 to 3.9.1

[dependabot]

Bumps prettier from 3.8.3 to 3.9.1.

Release notes

Sourced from prettier's releases.

3.9.1

• CLI: Fix ignored file has been cached incorrectly (#19483 by @​kovsu)

🔗 Changelog

3.9.0

diff

🔗 Prettier 3.9: Major parser upgrades and Formatting improvements

3.8.5

• Fix Flow variance annotation print (#19022 by @​marcoww6)

🔗 Changelog

3.8.4

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

🔗 Changelog

Changelog

Sourced from prettier's changelog.

3.9.1

diff

CLI: Fix ignored file has been cached incorrectly (#19483 by @​kovsu)

Bug details prettier/prettier#18016

3.9.0

diff

🔗 Release Notes

3.8.5

diff

Flow: Support readonly as a variance annotation (#19022 by @​marcoww6)

Flow now accepts readonly as a property variance annotation, equivalent to + (covariant/read-only).

// Input
type T = {
  readonly foo: string,
};
// Prettier 3.8.4
SyntaxError
// Prettier 3.8.5
type T = {
readonly foo: string,
};

3.8.4

diff

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
</tr></table> 

... (truncated)

Commits

• c47654c Release 3.9.1
• 06159aa Fix bug in release script
• 4bc5ab4 Update file-entry-cache to 11.1.5 (#19483)
• b7fd58b Release @prettier/plugin-oxc@0.2.0 and @prettier/plugin-hermes@0.2.0
• 3006400 Revert changes in release script
• 7bef7db Git blame ignore 3.9.0
• bb817b1 Bump Prettier dependency to 3.9.0
• 05cf896 Clean changelog_unreleased
• 79f6cdf Disable finished steps
• 3613b1e Add blog post for v3.9 (#19414)
• Additional commits viewable in compare view

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Project	Deployment	Actions	Updated (UTC)
nodejs-learn	Ready	Preview	Jul 1, 2026 2:39pm

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👋 Codeowner Review Request

The following codeowners have been identified for the changed files:

Team reviewers: @nodejs/nodejs-website

Please review the changes when you have a chance. Thank you! 🙏