build(deps-dev): bump webpack-dev-server in /manager-dashboard

Bumps [webpack-dev-server](https://github.com/webpack/webpack-dev-server) from 3.11.3 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@v3.11.3...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]

manager-dashboard/package.json

@@ -121,7 +121,7 @@
         "unimported": "^1.19.1",
         "webpack": "^5.27.0",
         "webpack-cli": "^4.5.0",
-        "webpack-dev-server": "^3.11.2",
+        "webpack-dev-server": "^5.2.1",
         "webpack-merge": "^5.8.0",
         "webpack-pwa-manifest": "^4.3.0",
         "workbox-webpack-plugin": "^6.1.5"