Maven repository become unavailable

[PhantomYdn]

The mentioned maven repository https://heisluft.tk/maven/ is not available anymore.

[Cervator]

Just for reference the updated URL at least for a while was https://heisluft.de/maven/ - but that is also unresponsive right now. Think it might have been before then come back. We published a copy to our own artifact repository (which in fairness also does crash once in a rare while till we give it a kick)