Bump mini-css-extract-plugin from 2.9.2 to 2.9.3 in /ui

Bumps [mini-css-extract-plugin](https://github.com/webpack-contrib/mini-css-extract-plugin) from 2.9.2 to 2.9.3.
- [Release notes](https://github.com/webpack-contrib/mini-css-extract-plugin/releases)
- [Changelog](https://github.com/webpack-contrib/mini-css-extract-plugin/blob/master/CHANGELOG.md)
- [Commits](webpack/mini-css-extract-plugin@v2.9.2...v2.9.3)

---
updated-dependencies:
- dependency-name: mini-css-extract-plugin
  dependency-version: 2.9.3
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

ui/package-lock.json

@@ -44,7 +44,7 @@
     "husky": "^9.1.7",
     "imagemin": "^9.0.1",
     "jest": "^30.0.5",
-    "mini-css-extract-plugin": "^2.9.2",
+    "mini-css-extract-plugin": "^2.9.3",
     "postcss": "^8.5.6",
     "prettier": "^3.6.2",
     "prop-types": "^15.8.1",