Modified `ricu` version used for `icuDG`

See https://github.com/prockenschaub/icuDG and the following manuscript for more information

@article{rockenschaub2023generalisability,
      title={Generalisability of deep learning-based early warning in the intensive care unit: a retrospective empirical evaluation}, 
      author={Patrick Rockenschaub and Adam Hilbert and Tabea Kossen and Falk von Dincklage and Vince Istvan Madai and Dietmar Frey},
      year={2023},
      eprint={2303.15354},
      archivePrefix={arXiv},
      primaryClass={cs.LG}
}