Hipe4ml

- Fix python version compatibility issues

- Remove python 3.8 and 3.9
- Update tests for model handler

- Fix CI and adapt to new versions of the dependencies (xgboost still to be updated, coming in the next release)
- Globbing support for reading trees located in different TDirectories of the same file

**Full Changelog**: https://github.com/hipe4ml/hipe4ml/compare/v0.0.15...v0.0.16

- Update the dependencies
- Minor fixes

- Use `optuna` for the optimisation of the hyperparameters
- Improve the interface of `ModelHandler`
- Fix tests, bump packages, sprinkle magic