fix(deps): update dependency lightningcss to v1.21.8

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
lightningcss	1.21.7 -> 1.21.8

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Release Notes

parcel-bundler/lightningcss (lightningcss)

### [`v1.21.8`](https://togithub.com/parcel-bundler/lightningcss/releases/tag/v1.21.8) [Compare Source](https://togithub.com/parcel-bundler/lightningcss/compare/393013928888d47ec7684d52ed79f758d371bd7b...v1.21.8) - [Support bundle and bundleAsync APIs in wasm builds](https://togithub.com/parcel-bundler/lightningcss/pull/583) - [Fix type usage of Features](https://togithub.com/parcel-bundler/lightningcss/pull/570) - rust: [Make Visitor bounded by ?Sized](https://togithub.com/parcel-bundler/lightningcss/pull/574)

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