build(deps-dev): bump webpack-dev-server in /frontend (#746)

Bumps [webpack-dev-server](https://github.com/webpack/webpack-dev-server) from 3.11.0 to 3.11.2.
- [Release notes](https://github.com/webpack/webpack-dev-server/releases)
- [Changelog](https://github.com/webpack/webpack-dev-server/blob/v3.11.2/CHANGELOG.md)
- [Commits](webpack/webpack-dev-server@v3.11.0...v3.11.2)

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

Author: dependabot[bot]

frontend/package-lock.json

@@ -47,7 +47,7 @@
     "terser-webpack-plugin": "^4.1.0",
     "webpack": "^4.40.2",
     "webpack-cli": "^4.0.0",
-    "webpack-dev-server": "^3.7.2",
+    "webpack-dev-server": "^3.11.2",
     "webpack-merge": "^5.2.0"
   },
   "dependencies": {