chore: update postcss requirement in /web-portfolio

Updates the requirements on [postcss](https://github.com/postcss/postcss) to permit the latest version.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.5.1...8.5.2)

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

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

web-portfolio/package.json

@@ -30,7 +30,7 @@
     "eslint-plugin-react-hooks": "^5.1.0",
     "eslint-plugin-react-refresh": "^0.4.18",
     "globals": "^15.14.0",
-    "postcss": "^8.5.1",
+    "postcss": "^8.5.2",
     "tailwindcss": "3",
     "vite": "^6.1.0",
     "vite-plugin-sitemap": "^0.7.1"