MAINT: NumPy 2 compatibility

[DerWeh]

NumPy 2 mainly cleanses up namespaces. Switch to future-prove names.

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 82.81%. Comparing base (296ee9c) to head (6980098).

Files	Patch %	Lines
gftool/precision.py	33.33%	2 Missing ⚠️
gftool/pade.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           develop      #36   +/-   ##
========================================
  Coverage    82.81%   82.81%           
========================================
  Files           31       31           
  Lines         2147     2147           
  Branches       214      214           
========================================
  Hits          1778     1778           
  Misses         286      286           
  Partials        83       83           

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