Switch DuniterPy usage back to PyPI release
DuniterPy is currently used from `git` `main` branch. Once DuniterPy v1.2.0 is released: - [x] Switch DuniterPy back to stable release from PyPI (`~1.2.0`) - `~` allows patches updates - [x] Switch DeathReaper repo back to `pip` image (#443) (lightweight image) - I don’t think DuniterPy will be used from `git` again, otherwise following change can be re-introduced - Revert 6d846c77
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