Fix issue #628 with '.A' stuff on csr_matrix

[quentinhaenn]

Description

Fix the issue concerning '.A' alias deprecated with latest Scipy version (from 1.11). Change '.A' to '.toarray()' in scoring functions in knn models. Also fixing upper bound on numpy version until compatibility is done in requirements

Related Issues

Fix #629

Checklist:

• [ ] I have added tests.
• [ ] I have updated the documentation accordingly.
• [ ] I have updated README.md (if you are adding a new model).
• [ ] I have updated examples/README.md (if you are adding a new example).
• [ ] I have updated datasets/README.md (if you are adding a new dataset).