chore: bump up milkdown to v7.21.3

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
@milkdown/crepe (source)	7.21.2 → 7.21.3
@milkdown/kit (source)	7.21.2 → 7.21.3
@milkdown/react (source)	7.21.2 → 7.21.3

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Release Notes

Milkdown/milkdown (@​milkdown/crepe)

v7.21.3

Compare Source

Patch Changes

• 95b07b9: Milkdown fix version release.

Milkdown/milkdown (@​milkdown/kit)

v7.21.3

Compare Source

Please refer to CHANGELOG.md for details.

Milkdown/milkdown (@​milkdown/react)

v7.21.3

Compare Source

Patch Changes

• 95b07b9: Milkdown fix version release.

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Project	Deployment	Actions	Updated (UTC)
milkdown	Ready	Preview, Comment	Jul 12, 2026 4:46pm

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Latest commit: cbe5b21

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