Bump redis from 3.1.0 to 3.2.0 in /backend/uclapi
Bump redis from 3.1.0 to 3.2.0 in /backend/uclapi

Bumps [redis](https://github.com/andymccurdy/redis-py) from 3.1.0 to 3.2.0.
- [Release notes](https://github.com/andymccurdy/redis-py/releases)
- [Changelog](https://github.com/andymccurdy/redis-py/blob/master/CHANGES)
- [Commits](https://github.com/andymccurdy/redis-py/compare/3.1.0...3.2.0)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
uclapi/uclapi,uclapi/uclapi,uclapi/uclapi,uclapi/uclapi