chore(deps): update dependency tsdown to v0.21.9

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
tsdown (source)	0.21.8 → 0.21.9

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Release Notes

rolldown/tsdown (tsdown)

v0.21.9

Compare Source

   🚀 Features

• Upgrade rolldown  -  by @​sxzz (2d74e)
• config: Track transitive config dependencies for watch reload  -  by @​sxzz in #​919 (16e27)
• exports: Add bin to publishConfig when devExports is enabled  -  by @​sxzz in #​911 (60592)
• plugin: Add tsdownConfig and tsdownConfigResolved plugin hooks  -  by @​sxzz in #​918 (665e5)

   🐞 Bug Fixes

• Skip package.json writting when content is deeply equal  -  by @​ocavue and @​sxzz in #​913 (d8e1c)
• Skip Node.js version check in Bun  -  by @​sxzz (38afd)
• css: Detect css modules from full id for vue virtual sfc styles  -  by @​sxzz in #​917 (e6021)

    View changes on GitHub

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[doistbot]

This PR updates the tsdown dependency to version 0.21.9, bringing in a few minor feature enhancements and bug fixes from the upstream release. The update safely keeps our tooling current, and no issues were flagged during the review.

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