Bump amphp/amp from 2.4.1 to 2.4.2

Bumps [amphp/amp](https://github.com/amphp/amp) from 2.4.1 to 2.4.2.
- [Release notes](https://github.com/amphp/amp/releases)
- [Changelog](https://github.com/amphp/amp/blob/master/CHANGELOG.md)
- [Commits](https://github.com/amphp/amp/compare/v2.4.1...v2.4.2

)

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