What's Changed
* Improve docstrings and comments by Cito in https://github.com/ghga-de/ghga-service-commons/pull/28
* Add middleware for correlation IDs(GSI-500) by TheByronHimes in https://github.com/ghga-de/ghga-service-commons/pull/29
**Full Changelog**: https://github.com/ghga-de/ghga-service-commons/compare/1.2.0...1.3.0