Bump rayon from 1.5.0 to 1.5.1 (#23)

Bumps [rayon](https://github.com/rayon-rs/rayon) from 1.5.0 to 1.5.1.
- [Release notes](https://github.com/rayon-rs/rayon/releases)
- [Changelog](https://github.com/rayon-rs/rayon/blob/master/RELEASES.md)
- [Commits](rayon-rs/rayon@rayon-core-v1.5.0...v1.5.1)

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Author: dependabot[bot]