build(deps-dev): bump postcss from 8.5.26 to 8.5.28

Bumps [postcss](https://github.com/postcss/postcss) from 8.5.26 to 8.5.28.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.5.26...8.5.28)

---
updated-dependencies:
- dependency-name: postcss
  dependency-version: 8.5.28
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

apps/evals/package.json

@@ -34,7 +34,7 @@
     "@types/react": "19.2.18",
     "@types/react-dom": "19.2.5",
     "@vitejs/plugin-react": "6.1.1",
-    "postcss": "8.5.26",
+    "postcss": "8.5.28",
     "storybook": "10.3.6",
     "tailwindcss": "4.3.3",
     "tailwindcss-animate": "1.0.7",