As reported in #39676 the build broke because of ca52152 as the bump of
`pythonPackages.botocore` to 1.10.9 clashed with the wanted dependencies
in `awscli`.
In order to reduce the risk of accidental bugs because of loosened
version constraints I bumped the AWS CLI to `1.15.10` which depends on
`botocore@1.10` as well.
Fixes#39676