Warnings on RUST_LOG=warn

[nitisht]

on RUST_LOG=warn there are bunch of these warnings

aws_smithy_client::builder] Retries require a `sleep_impl`, but none was passed into the builder. No retries will occur with the current configuration. If this was intentional, you can suppress this message with `Client::set_sleep_impl(None). Otherwise, unless you have a good reason to use the low-level service client API, consider using the `aws-config` crate to load a shared config from the environment, and construct a fluent client from that. If you need to use the low-level service client API, then pass in a sleep implementation to make timeouts and retry work.