build(deps): bump webpack-sources from 3.2.2 to 3.2.3 (#847)

Bumps [webpack-sources](https://github.com/webpack/webpack-sources) from 3.2.2 to 3.2.3.
- [Release notes](https://github.com/webpack/webpack-sources/releases)
- [Commits](webpack/webpack-sources@v3.2.2...v3.2.3)

---
updated-dependencies:
- dependency-name: webpack-sources
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]