feat: upgrade esbuild to 0.21.4, opts-in for decorators

[belgattitude]

This uprades the esbuild requirements to ^0.21.3, closes https://github.com/egoist/tsup/issues/1115

Motivations

• get latest features and fixes https://github.com/evanw/esbuild/releases, notably opt-in for decorators

Tests done:

I didn't notice regressions so far. I've forced latest esbuild in few projects by using resolutions (ie: https://github.com/belgattitude/httpx/blob/16e7dcebf8a2c2f90e53f0beb7d87eeaf8698fc6/package.json#L80)

Haven't had the chance to test it with projects bundling css, so I hope there wasn't breaking changes.

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Name	Status	Preview	Comments	Updated (UTC)
tsup	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 3, 2024 2:30am

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New and removed dependencies detected. Learn more about Socket for GitHub ↗︎

Package	New capabilities	Transitives	Size	Publisher
npm/esbuild@0.21.4	environment, filesystem, network, shell	0	133 kB	evanw

🚮 Removed packages: npm/esbuild@0.19.2

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[github-actions[bot]]

:tada: This PR is included in version 8.1.0 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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[TheMikeyRoss]

welcome back :)