Bump webpack-dev-server from 4.7.4 to 4.8.1

Bumps [webpack-dev-server](https://github.com/webpack/webpack-dev-server) from 4.7.4 to 4.8.1.
- [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/v4.7.4...v4.8.1)

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

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

package.json

@@ -64,7 +64,7 @@
     "url-loader": "^4.1.1",
     "webpack": "^5.72.0",
     "webpack-cli": "^4.9.2",
-    "webpack-dev-server": "^4.7.4",
+    "webpack-dev-server": "^4.8.1",
     "webpack-manifest-plugin": "^5.0.0",
     "webpack-merge": "^5.7.3"
   },