Please use the commands mvn release:prepare and mvn release:perform to release a new version and upload it to the nexus of widas.
For this you will need a settings.xml for maven with the credentials of the nexus server.
Ask maintainers of this project for the information!
To upload a new release to maven central, please use the command: mvn clean deploy -DdeployToCentral=true.
Also for this step, we need to have some credentials in the settings.xml and have install gpg on the local machine.
Please look at this guide for more information!