Bump lodash, karma-coverage and karma-webpack

Bumps [lodash](https://github.com/lodash/lodash) to 4.17.21 and updates ancestor dependencies [lodash](https://github.com/lodash/lodash), [karma-coverage](https://github.com/karma-runner/karma-coverage) and [karma-webpack](https://github.com/webpack-contrib/karma-webpack). These dependencies need to be updated together.


Updates `lodash` from 4.17.4 to 4.17.21
- [Release notes](https://github.com/lodash/lodash/releases)
- [Commits](lodash/lodash@4.17.4...4.17.21)

Updates `karma-coverage` from 1.1.1 to 1.1.2
- [Release notes](https://github.com/karma-runner/karma-coverage/releases)
- [Changelog](https://github.com/karma-runner/karma-coverage/blob/master/CHANGELOG.md)
- [Commits](karma-runner/karma-coverage@v1.1.1...v1.1.2)

Updates `karma-webpack` from 2.0.9 to 2.0.13
- [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...v2.0.13)

---
updated-dependencies:
- dependency-name: lodash
  dependency-type: indirect
- dependency-name: karma-coverage
  dependency-type: direct:development
- dependency-name: karma-webpack
  dependency-type: direct:development
...

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