chore(release): 1.6.0 [skip ci]

# [1.6.0](https://gitlab.ics.muni.cz/perun-proxy-aai/python/perun-proxy-utils/compare/v1.5.0...v1.6.0) (2023-06-15)

### Features

* extend check_saml with logout ([aa218b58](https://gitlab.ics.muni.cz/perun-proxy-aai/python/perun-proxy-utils/commit/aa218b581ad6c35319617a3479b49863c6c385e0))