build(deps-dev): bump webpack-dev-server from 4.13.3 to 4.15.0

Bumps [webpack-dev-server](https://github.com/webpack/webpack-dev-server) from 4.13.3 to 4.15.0.
- [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@v4.13.3...v4.15.0)

---
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

@@ -33,7 +33,7 @@
     "style-loader": "2.0.0",
     "webpack": "4.46.0",
     "webpack-cli": "^4.10.0",
-    "webpack-dev-server": "4.13.3"
+    "webpack-dev-server": "4.15.0"
   },
   "dependencies": {
     "@axetroy/react-download": "1.1.1",