:arrow_up: Bump boto3 from 1.16.38 to 1.16.40 in /backend/uclapi
:arrow_up: Bump boto3 from 1.16.38 to 1.16.40 in /backend/uclapi

Bumps [boto3](https://github.com/boto/boto3) from 1.16.38 to 1.16.40.
- [Release notes](https://github.com/boto/boto3/releases)
- [Changelog](https://github.com/boto/boto3/blob/develop/CHANGELOG.rst)
- [Commits](https://github.com/boto/boto3/compare/1.16.38...1.16.40)

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