Bump ruptures from 1.1.8 to 1.1.9

Bumps [ruptures](https://github.com/deepcharles/ruptures) from 1.1.8 to 1.1.9.
- [Release notes](https://github.com/deepcharles/ruptures/releases)
- [Changelog](https://github.com/deepcharles/ruptures/blob/master/CHANGELOG.md)
- [Commits](deepcharles/ruptures@v1.1.8...v1.1.9)

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

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