Build(deps-dev): Bump webpack-dev-server from 3.5.1 to 3.7.1

Bumps [webpack-dev-server](https://github.com/webpack/webpack-dev-server) from 3.5.1 to 3.7.1.
- [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@v3.5.1...v3.7.1)

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

Author: dependabot-preview[bot]

package-lock.json

@@ -16,6 +16,6 @@
     "html-webpack-plugin": "^3.2.0",
     "webpack": "^4.33.0",
     "webpack-cli": "^3.3.2",
-    "webpack-dev-server": "^3.5.1"
+    "webpack-dev-server": "^3.7.1"
   }
 }