Bump sinon from 9.0.2 to 9.0.3 (#283)

Bumps [sinon](https://github.com/sinonjs/sinon) from 9.0.2 to 9.0.3.
- [Release notes](https://github.com/sinonjs/sinon/releases)
- [Changelog](https://github.com/sinonjs/sinon/blob/master/CHANGELOG.md)
- [Commits](sinonjs/sinon@v9.0.2...v9.0.3)

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