Bump phpspec/prophecy from 1.10.2 to 1.10.3

Bumps [phpspec/prophecy](https://github.com/phpspec/prophecy) from 1.10.2 to 1.10.3.
- [Release notes](https://github.com/phpspec/prophecy/releases)
- [Changelog](https://github.com/phpspec/prophecy/blob/master/CHANGES.md)
- [Commits](https://github.com/phpspec/prophecy/compare/v1.10.2...v1.10.3

)

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