Support Numpy v2

[keurfonluu]

• Fixed: use np.complex128 instead of np.complex_ (fixes issue Updating for Numpy > v2.0 #43)

Reminders:

• Run invoke format to make sure the code follows the style guide,
• Add tests for new features or tests that would have caught the bug that you're fixing,
• Write detailed docstrings for all functions, classes and/or methods,
• If adding new functionality, unit test it and add it to the documentation.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.89%. Comparing base (10dcb4c) to head (18b7d02).
Report is 57 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #44      +/-   ##
==========================================
- Coverage   92.21%   91.89%   -0.32%     
==========================================
  Files          15       15              
  Lines        1220     1222       +2     
==========================================
- Hits         1125     1123       -2     
- Misses         95       99       +4     

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