Bump webpack-dev-server from 4.12.0 to 4.13.1 in /ed (#307)

Bumps [webpack-dev-server](https://github.com/webpack/webpack-dev-server) from 4.12.0 to 4.13.1.
- [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@v4.12.0...v4.13.1)

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

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

Author: dependabot[bot]

ed/package-lock.json

@@ -34,7 +34,7 @@
     "url-loader": "^4.1.0",
     "webpack": "^4.46.0",
     "webpack-cli": "^4.10.0",
-    "webpack-dev-server": "^4.12.0",
+    "webpack-dev-server": "^4.13.1",
     "webpack-shell-plugin": "^0.5.0"
   }
 }