Bump robolectric from 4.8.2 to 4.9

Bumps [robolectric](https://github.com/robolectric/robolectric) from 4.8.2 to 4.9.
- [Release notes](https://github.com/robolectric/robolectric/releases)
- [Commits](https://github.com/robolectric/robolectric/compare/robolectric-4.8.2...robolectric-4.9

)

---
updated-dependencies:
- dependency-name: org.robolectric:robolectric
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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