Bump webpack-dev-server from 3.11.2 to 4.0.0 (#208)

Bumps [webpack-dev-server](https://github.com/webpack/webpack-dev-server) from 3.11.2 to 4.0.0.
- [Release notes](https://github.com/webpack/webpack-dev-server/releases)
- [Changelog](https://github.com/webpack/webpack-dev-server/blob/master/CHANGELOG.md)
- [Commits](https://github.com/webpack/webpack-dev-server/compare/v3.11.2...v4.0.0)

---
updated-dependencies:
- dependency-name: webpack-dev-server
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

package.json

@@ -69,7 +69,7 @@
     "webpack": "^5.11.0",
     "webpack-cli": "^4.2.0",
     "webpack-dev-middleware": "^4.1.0",
-    "webpack-dev-server": "^3.11.0",
+    "webpack-dev-server": "^4.0.0",
     "webpack-merge": "^5.7.3",
     "workbox-webpack-plugin": "^6.1.2"
   }