Bump async-timeout from 1.2.1 to 2.0.0 in /backend/uclapi
Bump async-timeout from 1.2.1 to 2.0.0 in /backend/uclapi

Bumps [async-timeout](https://github.com/aio-libs/async_timeout) from 1.2.1 to 2.0.0.
- [Changelog](https://github.com/aio-libs/async-timeout/blob/master/CHANGES.rst)
- [Commits](https://github.com/aio-libs/async_timeout/compare/v1.2.1...v2.0.0)
uclapi/uclapi,uclapi/uclapi,uclapi/uclapi,uclapi/uclapi