Bump postcss from 8.4.6 to 8.4.8

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.6 to 8.4.8.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.4.6...8.4.8)

---
updated-dependencies:
- dependency-name: postcss
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

package-lock.json

@@ -24,7 +24,7 @@
 		"svelte-preprocess": "^4.10.3",
 		"tslib": "^2.0.0",
 		"typescript": "^4.5.5",
-		"postcss": "^8.4.4",
+		"postcss": "^8.4.8",
 		"postcss-load-config": "^3.1.3",
 		"autoprefixer": "^10.4.2",
 		"cssnano": "^5.0.17",