Bump nio4r from 2.5.5 to 2.5.7
Bump nio4r from 2.5.5 to 2.5.7

Bumps [nio4r](https://github.com/socketry/nio4r) from 2.5.5 to 2.5.7.
- [Release notes](https://github.com/socketry/nio4r/releases)
- [Changelog](https://github.com/socketry/nio4r/blob/master/CHANGES.md)
- [Commits](https://github.com/socketry/nio4r/compare/v2.5.5...v2.5.7)

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