Update dependency tsup to v6

[sebasptsch]

This PR contains the following updates:

Package	Type	Update	Change
tsup	devDependencies	major	^5.12.1 -> ^6.0.0

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Release Notes

egoist/tsup

v6.1.2

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Bug Fixes

• make --minify work with es5 target, fix #​653 (8230221)

v6.1.1

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Features

• cli: add --tsconfig flag to accept custom tsconfig path (#​652) (58d0145)
• minor: use shell option for complex commands in onSuccess (#​649) (be48b8b)

v6.1.0

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Bug Fixes

• allow format to be a string in config file (0a96985)
• ignore esbuild warning if silent is true (#​643) (36e2199)

Features

• allow to use an object as entry with --entry flag (33a7c5f)
• new option outExtension (b9cd8d5)
• support custom config file with --config flag (90f2d1a)

v6.0.1

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Bug Fixes

• add missing tsup-node command (a175339)

v6.0.0

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Upgrade guide

• shims option is false by default: If you're dual-publishing (i.e. --format esm,cjs) and using platform specific API like import.meta.url, __dirname and __filename, you need to manually enable --shims flag now, because import.meta.url won't work in a cjs module, and __dirname, __filename won't work in an esm module.
• target option is now node14 by default: previously it was node12, the minimal node version that tsup can run in is also changed to node14

New Features

• New treeshake option: You can use Rollup for tree-shaking now, read more https://tsup.egoist.sh/#tree-shaking

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