build(deps-dev): bump webpack-dev-server

Bumps [webpack-dev-server](https://github.com/webpack/webpack-dev-server) from 4.15.2 to 5.2.1.
- [Release notes](https://github.com/webpack/webpack-dev-server/releases)
- [Changelog](https://github.com/webpack/webpack-dev-server/blob/main/CHANGELOG.md)
- [Commits](webpack/webpack-dev-server@v4.15.2...v5.2.1)

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

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

Author: dependabot[bot]

dashboard/fluid-ks-extension/package.json

@@ -146,7 +146,7 @@
     "webpack-assets-manifest": "^5.0.6",
     "webpack-bundle-analyzer": "^4.5.0",
     "webpack-cli": "^4.9.1",
-    "webpack-dev-server": "^4.3.1",
+    "webpack-dev-server": "^5.2.1",
     "webpack-merge": "^5.8.0",
     "webpack-merge-json-plugin": "^0.1.0",
     "webpackbar": "^5.0.0-3",