build(deps-dev): bump @types/webpack-sources from 3.2.1 to 3.2.3 (FullHuman#1190)

Bumps [@types/webpack-sources](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/webpack-sources) from 3.2.1 to 3.2.3.
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/webpack-sources)

---
updated-dependencies:
- dependency-name: "@types/webpack-sources"
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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