chore(deps): bump postcss from 8.5.8 to 8.5.23 in /apps/webui

Bumps [postcss](https://github.com/postcss/postcss) from 8.5.8 to 8.5.23.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.5.8...8.5.23)

---
updated-dependencies:
- dependency-name: postcss
  dependency-version: 8.5.23
  dependency-type: direct:development
...

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

Author: dependabot[bot]

apps/webui/package-lock.json

@@ -53,7 +53,7 @@
     "fast-check": "^4.3.0",
     "globals": "^16.5.0",
     "jsdom": "^28.1.0",
-    "postcss": "^8.5.8",
+    "postcss": "^8.5.23",
     "tailwindcss": "^3.4.19",
     "tailwindcss-animate": "^1.0.7",
     "typescript": "~5.9.3",