chore(deps): bump webpack-dev-server from 4.15.1 to 5.0.4

Bumps [webpack-dev-server](https://github.com/webpack/webpack-dev-server) from 4.15.1 to 5.0.4.
- [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@v4.15.1...v5.0.4)

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

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

packages/fxa-settings/package.json

@@ -186,7 +186,7 @@
     "ua-parser-js": "1.0.35",
     "uuid": "^9.0.0",
     "webpack": "^5.64.4",
-    "webpack-dev-server": "^4.6.0",
+    "webpack-dev-server": "^5.0.4",
     "webpack-manifest-plugin": "^5.0.0",
     "workbox-webpack-plugin": "^7.0.0"
   },