Bump loader-utils in /src/cfn-custom-resources/react-app/react-app (aws-samples#218)

Bumps [loader-utils](https://github.com/webpack/loader-utils) from 2.0.2 to 2.0.3.
- [Release notes](https://github.com/webpack/loader-utils/releases)
- [Changelog](https://github.com/webpack/loader-utils/blob/v2.0.3/CHANGELOG.md)
- [Commits](webpack/loader-utils@v2.0.2...v2.0.3)

---
updated-dependencies:
- dependency-name: loader-utils
  dependency-type: indirect
...

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