What's Changed
* Use generator for output directory for CMake
* correct short license text to SPDX standard `Apache-2.0`
* CHIA-2095 Upgrade vdf_client's boost asio io_service code to using io_context
* Bump cmake from 0.1.50 to 0.1.52 (rust)
* Bump bindgen from 0.69.4 to 0.71.1 (rust)
* Bump crate version to 1.1.9
**Full Changelog**: https://github.com/Chia-Network/chiavdf/compare/1.1.8...1.1.9