Chore: 2.9.0

# [2.9.0](v2.8.1...v2.9.0) (2022-12-16)

### New

* search api interface (coscine/issues#1863) ([04ec3e22](04ec3e22)), closes [coscine/issues#1863](https://git.rwth-aachen.de/coscine/issues/issues/1863)