Support numpy 2

[kmnhan]

• lmfit 1.3.1 is not compatible with numpy 2, wait for 1.3.2 release and update dependencies
• Various unrelated bug fixes

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.25%. Comparing base (5371767) to head (b5d8aa4).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #48      +/-   ##
==========================================
- Coverage   72.27%   72.25%   -0.02%     
==========================================
  Files          65       65              
  Lines       10085    10085              
==========================================
- Hits         7289     7287       -2     
- Misses       2796     2798       +2     

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