chore(release): 4.2.1 [skip ci]

## [4.2.1](https://gitlab.ics.muni.cz/perun-proxy-aai/simplesamlphp/simplesamlphp-module-cesnet/compare/v4.2.0...v4.2.1) (2023-11-28)

### Bug Fixes

*  Potential Undefined array key in IsEinfrAssured ([36c849a7](https://gitlab.ics.muni.cz/perun-proxy-aai/simplesamlphp/simplesamlphp-module-cesnet/commit/36c849a7faa90c4f8fa77cff71ecabbc774edcd9))