build(deps-dev): bump postcss from 8.5.2 to 8.5.3

Bumps [postcss](https://github.com/postcss/postcss) from 8.5.2 to 8.5.3.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.5.2...8.5.3)

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

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

packages/frontend/package.json

@@ -34,7 +34,7 @@
     "@types/humanize-duration": "^3.27.4",
     "@typescript-eslint/eslint-plugin": "8.24.1",
     "jsdom": "^26.0.0",
-    "postcss": "^8.5.2",
+    "postcss": "^8.5.3",
     "postcss-load-config": "^6.0.1",
     "svelte": "5.20.2",
     "svelte-fa": "^4.0.3",