Bump redux-form from 5.3.6 to 8.3.9 in /cerberus-dashboard

Bumps [redux-form](https://github.com/redux-form/redux-form) from 5.3.6 to 8.3.9.
- [Release notes](https://github.com/redux-form/redux-form/releases)
- [Changelog](https://github.com/redux-form/redux-form/blob/master/CHANGELOG.md)
- [Commits](redux-form/redux-form@v5.3.6...v8.3.9)

---
updated-dependencies:
- dependency-name: redux-form
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]