chore(deps): update dependency @swc/core to ^1.7.21

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@swc/core (source)	^1.7.18 -> ^1.7.21

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Release Notes

swc-project/swc (@​swc/core)

### [`v1.7.21`](https://togithub.com/swc-project/swc/blob/HEAD/CHANGELOG.md#1721---2024-08-28) [Compare Source](https://togithub.com/swc-project/swc/compare/v1.7.19...v1.7.21) ##### Bug Fixes - **(es/typescript)** Preserve more comments ([#​9509](https://togithub.com/swc-project/swc/issues/9509)) ([3e253ec](https://togithub.com/swc-project/swc/commit/3e253ecc21f2028437572093b42df97ef5fe505e)) ### [`v1.7.19`](https://togithub.com/swc-project/swc/blob/HEAD/CHANGELOG.md#1719---2024-08-28) [Compare Source](https://togithub.com/swc-project/swc/compare/v1.7.18...v1.7.19) ##### Bug Fixes - **(es/minifier)** Track if a var is used with `in` ([#​9508](https://togithub.com/swc-project/swc/issues/9508)) ([7d6269e](https://togithub.com/swc-project/swc/commit/7d6269e3b826524e340edf274a5e42b2a0ea058a)) ##### Features - **(es/minifier)** Support mangle cache ([#​9489](https://togithub.com/swc-project/swc/issues/9489)) ([af922d8](https://togithub.com/swc-project/swc/commit/af922d83e58596021476006564edb6270069d437)) - **(plugin/runner)** Improve error message ([#​9502](https://togithub.com/swc-project/swc/issues/9502)) ([da52930](https://togithub.com/swc-project/swc/commit/da529304fe23bcb1a15c25811f928ebf91207ef0)) ##### Miscellaneous Tasks - **(es/codegen)** Bump minimum required swc_allocator version to 0.1.8 ([#​9492](https://togithub.com/swc-project/swc/issues/9492)) ([5258763](https://togithub.com/swc-project/swc/commit/5258763cf673e1684808bc2766ba6ee9c84642f1)) ##### Refactor - **(es/utils)** Unify `prepend_stmts` ([#​9493](https://togithub.com/swc-project/swc/issues/9493)) ([faec8c1](https://togithub.com/swc-project/swc/commit/faec8c134d950d10a9f2dce0e5680d9230f87ceb))

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