Bump unicode-segmentation from 1.7.1 to 1.8.0

Bumps [unicode-segmentation](https://github.com/unicode-rs/unicode-segmentation) from 1.7.1 to 1.8.0.
- [Release notes](https://github.com/unicode-rs/unicode-segmentation/releases)
- [Commits](unicode-rs/unicode-segmentation@1.7.1...v1.8.0)

---
updated-dependencies:
- dependency-name: unicode-segmentation
  dependency-type: indirect
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>