Bump webpack-dev-server from 4.11.1 to 5.2.1 in /ui

Bumps [webpack-dev-server](https://github.com/webpack/webpack-dev-server) from 4.11.1 to 5.2.1.
- [Release notes](https://github.com/webpack/webpack-dev-server/releases)
- [Changelog](https://github.com/webpack/webpack-dev-server/blob/master/CHANGELOG.md)
- [Commits](webpack/webpack-dev-server@v4.11.1...v5.2.1)

---
updated-dependencies:
- dependency-name: webpack-dev-server
  dependency-version: 5.2.1
  dependency-type: direct:development
...

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

Author: dependabot[bot]

ui/package.json

@@ -35,7 +35,7 @@
     "terser-webpack-plugin": "5.3.6",
     "webpack": "^5.94.0",
     "webpack-cli": "^4.10.0",
-    "webpack-dev-server": "^4.11.1",
+    "webpack-dev-server": "^5.2.1",
     "webpack-merge": "^5.8.0"
   },
   "dependencies": {