Bump requests-file from 1.4.2 to 1.4.3 in /backend/uclapi
Bump requests-file from 1.4.2 to 1.4.3 in /backend/uclapi

Bumps [requests-file](https://github.com/dashea/requests-file) from 1.4.2 to 1.4.3.
- [Changelog](https://github.com/dashea/requests-file/blob/master/CHANGES.rst)
- [Commits](https://github.com/dashea/requests-file/commits)
uclapi/uclapi,uclapi/uclapi,uclapi/uclapi,uclapi/uclapi