adding to changelog

Author: sebastian-peter

CHANGELOG.md

@@ -86,6 +86,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - BREAKING: Updating PowerSystemUtils dependency to 2.0-SNAPSHOT [#595](https://github.com/ie3-institute/PowerSystemDataModel/issues/595)
 - BREAKING: Generified the `LoadInput` attribute `standardLoadProfile` to `loadProfile` as it should also address the newly added `TemperatureDependantLoadProfile`s [#601](https://github.com/ie3-institute/PowerSystemDataModel/issues/601)
 - Adapted to new double converters in PSU [#705](https://github.com/ie3-institute/PowerSystemDataModel/issues/705)
+- Setting fixed groovy version and updating groovy [#788](https://github.com/ie3-institute/PowerSystemDataModel/issues/788)
 
 ## [2.1.0] - 2022-01-05