Bump requests from 2.21.0 to 2.22.0 in /backend/uclapi
Bump requests from 2.21.0 to 2.22.0 in /backend/uclapi

Bumps [requests](https://github.com/requests/requests) from 2.21.0 to 2.22.0.
- [Release notes](https://github.com/requests/requests/releases)
- [Changelog](https://github.com/kennethreitz/requests/blob/master/HISTORY.md)
- [Commits](https://github.com/requests/requests/compare/v2.21.0...v2.22.0)

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