Bump postcss (#7529)

Bumps [postcss](https://github.com/postcss/postcss) from 8.5.22 to 8.5.25.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](https://github.com/postcss/postcss/compare/8.5.22...8.5.25)

---
updated-dependencies:
- dependency-name: postcss
  dependency-version: 8.5.25
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

python/samples/05-end-to-end/ag_ui_single_agent/frontend/package-lock.json

@@ -820,9 +820,9 @@
       }
     },
     "node_modules/postcss": {
-      "version": "8.5.22",
-      "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.5.22.tgz",
-      "integrity": "sha1-CGoNVoWnFaz1lQ67yxU4+vMFFpc=",
+      "version": "8.5.25",
+      "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.5.25.tgz",
+      "integrity": "sha512-DTPx3RWSSnWyzLxQnlH0rJP+EW5ekl16ZU4/psbIhA0e53kJfdgaN5vKM+xP7yJtXVu+nfdVFmlgFDEKAe4Pyw==",
       "dev": true,
       "funding": [
         {