Bump eslint-webpack-plugin from 3.2.0 to 4.0.1 in /ui/react-app (#3695)

Bumps [eslint-webpack-plugin](https://github.com/webpack-contrib/eslint-webpack-plugin) from 3.2.0 to 4.0.1.
- [Release notes](https://github.com/webpack-contrib/eslint-webpack-plugin/releases)
- [Changelog](https://github.com/webpack-contrib/eslint-webpack-plugin/blob/master/CHANGELOG.md)
- [Commits](webpack-contrib/eslint-webpack-plugin@v3.2.0...v4.0.1)

---
updated-dependencies:
- dependency-name: eslint-webpack-plugin
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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