Bump rayon from 1.8.0 to 1.8.1

Bumps [rayon](https://github.com/rayon-rs/rayon) from 1.8.0 to 1.8.1.
- [Changelog](https://github.com/rayon-rs/rayon/blob/master/RELEASES.md)
- [Commits](rayon-rs/rayon@rayon-core-v1.8.0...rayon-core-v1.8.1)

---
updated-dependencies:
- dependency-name: rayon
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>