Upgrade to esbuild ^0.21.3 (decorators)

[belgattitude]

First of all thanks for the work !

Here's a linked PR that does the change: #1116

PS: esbuild ^0.20.0 and esbuild ^0.21.3 have been released with some breaking changes https://github.com/evanw/esbuild/releases and new features. Notably decorators.

As tested on my repos by forcing 'resolutions' to esbuild 0.21.3 I didn't see any issues with tsup.

Motivations

• opt-in for decorators support
• get fixes from latest releases https://github.com/evanw/esbuild/releases

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[github-actions]

🎉 This issue has been resolved in version 8.1.0 🎉

The release is available on:

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

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