chore(deps): bump postcss in /waltid-applications/waltid-web-portal

Bumps [postcss](https://github.com/postcss/postcss) from 8.5.14 to 8.5.22.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.5.14...8.5.22)

---
updated-dependencies:
- dependency-name: postcss
  dependency-version: 8.5.22
  dependency-type: direct:production
...

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

Author: dependabot[bot]

waltid-applications/waltid-web-portal/package.json

@@ -23,7 +23,7 @@
     "eslint": "9.39.2",
     "eslint-config-next": "14.2.35",
     "next": "16.2.6",
-    "postcss": "8.5.14",
+    "postcss": "8.5.22",
     "react": "18.3.1",
     "react-dom": "18.3.1",
     "react-icons": "^5.2.1",