Update dependency tsup to v5.12.6

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
tsup	5.12.5 -> 5.12.6

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Release Notes

egoist/tsup

### [`v5.12.6`](https://togithub.com/egoist/tsup/releases/v5.12.6) [Compare Source](https://togithub.com/egoist/tsup/compare/v5.12.5...v5.12.6) ##### Bug Fixes - **dts:** use relative `baseUrl` in tsconfig, closes [#​611](https://togithub.com/egoist/tsup/issues/611) ([df40e12](https://togithub.com/egoist/tsup/commit/df40e12e9549cbd4db56085ff2f37f69a8ede4e9))

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