chore(deps-dev): bump tsdown from 0.15.9 to 0.21.4

[dependabot]

Bumps tsdown from 0.15.9 to 0.21.4.

Release notes

Sourced from tsdown's releases.

v0.21.4

   🚀 Features

• css: Add CSS modules support  -  by @​sxzz in rolldown/tsdown#834 (2a88a)

   🐞 Bug Fixes

• exports: Preserve CRLF line endings in package.json  -  by @​sxzz (a4d4e)

    View changes on GitHub

v0.21.3

   🚀 Features

• copy: Add support for watching copy source files  -  by @​schplitt in rolldown/tsdown#721 (7c23a)

   🐞 Bug Fixes

• css: Watch inline CSS files in watch mode  -  by @​sxzz (2051a)
• exports: Sort inlined dependencies by package name  -  by @​sxzz (0ec71)
• publint: Support Yarn v1  -  by @​sxzz (4a291)
• unbundle: Root should be lowest common ancestor of entry files  -  by @​sxzz (f1823)

    View changes on GitHub

v0.21.2

   🚨 Breaking Changes

• exe: Add exe.outDir for separate executable output dir, defaults to build  -  by @​sxzz (d49ef)

Note: Executable is still an experimental feature and does not follow SemVer. Breaking changes may occur in any release.

   🚀 Features

• Add root option for controlling output directory structure  -  by @​sxzz (bad2d)
• deps: Rename onlyAllowBundle to onlyBundle  -  by @​peaklabs-dev and @​sxzz in rolldown/tsdown#819 (cbd7b)

   🐞 Bug Fixes

• css: Skip data URIs and external URLs in CSS url() rebasing  -  by @​sxzz (13907)

    View changes on GitHub

v0.21.1

   🚨 Breaking Changes

• css: Move all CSS support to @tsdown/css package  -  by @​sxzz in rolldown/tsdown#809 (1b1a1)

[!IMPORTANT]

... (truncated)

Commits

• c5d4166 chore: release v0.21.4
• a417351 docs: update skills install commands with --skill flag
• cd4ce32 refactor(docs): clarify deprecated-but-compatible migration options
• d622ca5 docs: clarify tsdown-migrate skill and deprecated options (#835)
• f401a3b chore(deps): update all non-major dependencies (#820)
• 2a88a67 feat(css): add CSS modules support (#834)
• a4d4e1d fix(exports): preserve CRLF line endings in package.json
• 6151433 chore: release v0.21.3
• 7c23ad8 feat(copy): add support for watching copy source files (#721)
• f182324 fix(unbundle): root should be lowest common ancestor of entry files
• Additional commits viewable in compare view

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