build(deps-dev): bump karma-webpack from 3.0.0 to 3.0.4

Bumps [karma-webpack](https://github.com/webpack-contrib/karma-webpack) from 3.0.0 to 3.0.4.
- [Release notes](https://github.com/webpack-contrib/karma-webpack/releases)
- [Changelog](https://github.com/webpack-contrib/karma-webpack/blob/master/CHANGELOG.md)
- [Commits](codymikol/karma-webpack@v3.0.0...v3.0.4)

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

Author: dependabot-support

yarn.lock

@@ -2956,8 +2956,8 @@ karma-super-dots-reporter@^0.2.0:
     log-symbols "^1.0.1"
 
 karma-webpack@^3.0.0:
-  version "3.0.0"
-  resolved "https://registry.yarnpkg.com/karma-webpack/-/karma-webpack-3.0.0.tgz#bf009c5b73c667c11c015717e9e520f581317c44"
+  version "3.0.4"
+  resolved "https://registry.yarnpkg.com/karma-webpack/-/karma-webpack-3.0.4.tgz#c16b57d6b20afc00de11b04865b902015844ab34"
   dependencies:
     async "^2.0.0"
     babel-runtime "^6.0.0"