Improved timeouts
Update aws-crt-cpp to v0.10.3, which brings:
- BUGFIX: Many objects with async shutdown now use ref-counting under the hood. Should greatly reduce use-after-free errors. This does not affect the C++ API.
- BUGFIX: Increase default TLS-negotiation timeout from 4s to 10s.
- BUGFIX: Ensure bootstrap callback data is allocated by the bootstrap's allocator
- FEATURE: Instance Metadata Service (IMDS v2) Client
- FEATURE: Expose MqttConnection::SetReconnectTimeout(min, max)