chore(deps): update dependency lightningcss to v1.21.6

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
lightningcss	1.21.5 -> 1.21.6

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Release Notes

parcel-bundler/lightningcss (lightningcss)

### [`v1.21.6`](https://togithub.com/parcel-bundler/lightningcss/releases/tag/v1.21.6) [Compare Source](https://togithub.com/parcel-bundler/lightningcss/compare/v1.21.5...v1.21.6) #### Fixes - [Parse the @​starting-style rule](https://togithub.com/parcel-bundler/lightningcss/commit/eff8ce1a4e585c12b6ee888d8c6a351bca88cb8f) - [Fix custom top-level style blocks when not nested](https://togithub.com/parcel-bundler/lightningcss/commit/c7913b0e4f0aa78c3cc26b227aee89203d75b20d) - [Remove const enum in Features TS type definition](https://togithub.com/parcel-bundler/lightningcss/commit/4956d9b39d3c1bb790c1339c3c9983f6bc1b251e) - [Change Buffer to Uint8Array in TS types for non-Node compatibility](https://togithub.com/parcel-bundler/lightningcss/commit/0f30348a8b464172dfbb55dc29df7d2edb71c9a6) - [Fix a typo in media_query](https://togithub.com/parcel-bundler/lightningcss/commit/690b02223fad635912e5417d4be2b6b991a9a338) - [Fix serializing text-size-adjust](https://togithub.com/parcel-bundler/lightningcss/commit/1094590d4f9318179e31e01d48efa9297e14f3a5) - [Fix prefixing duplicate backdrop-filter properties](https://togithub.com/parcel-bundler/lightningcss/commit/94f254c8f56358dc255a59fd351d0bcbdcc38c49) - [Fix background-clip prefixing](https://togithub.com/parcel-bundler/lightningcss/commit/633f63e1bf7dc0d52dbd61e22559c61b0eb51040) - [Don't put unknown pseudo elements in an :is()](https://togithub.com/parcel-bundler/lightningcss/commit/284debfb4973a6a9b8be1b88b8bb5598e489c554) - [Make a node specific wasm build that initializes synchronously for stackblitz](https://togithub.com/parcel-bundler/lightningcss/commit/c0cc48c6e5f6066a1245cd514bf8cd37dc861862) - [Add freebsd build](https://togithub.com/parcel-bundler/lightningcss/commit/5492372c49eb1c2278a8cd6240ccc4aea17e7b34)

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[github-actions[bot]]

size-limit report 📦

Path	Size
css	24.33 KB (0%)
background	218.34 KB (0%)
ui	430.64 KB (0%)
contentscript	5.2 KB (0%)