MNT: ptp was removed from the ndarray class in NumPy 2.0

[pllim]

Description

This pull request is to keep up with continuous numpy 2.0.dev changes upstream. Something new every day.

[github-actions]

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[github-actions]

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[codecov]

Codecov Report

All modified lines are covered by tests ✅

Files	Coverage Δ
synphot/filter_parameterization/filter_fft.py	98.27% <100.00%> (ø)

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