Bump webpack-dev-middleware and karma-webpack

Removes [webpack-dev-middleware](https://github.com/webpack/webpack-dev-middleware). It's no longer used after updating ancestor dependency [karma-webpack](https://github.com/webpack-contrib/karma-webpack). These dependencies need to be updated together.


Removes `webpack-dev-middleware`

Updates `karma-webpack` from 2.0.9 to 5.0.1
- [Release notes](https://github.com/webpack-contrib/karma-webpack/releases)
- [Changelog](https://github.com/codymikol/karma-webpack/blob/master/CHANGELOG.md)
- [Commits](codymikol/karma-webpack@v2.0.9...v5.0.1)

---
updated-dependencies:
- dependency-name: webpack-dev-middleware
  dependency-type: indirect
- dependency-name: karma-webpack
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>

package.json

@@ -92,7 +92,7 @@
     "karma-selenium-webdriver-launcher": "0.0.4",
     "karma-sourcemap-loader": "0.3.7",
     "karma-spec-reporter": "0.0.20",
-    "karma-webpack": "2.0.9",
+    "karma-webpack": "5.0.1",
     "plato": "1.2.2",
     "react-test-renderer": "16.4.0",
     "selenium-webdriver": "3.4.0",