Replace deprecated scipy.interpolate.interp1d

[ericpre]

Fix #3223. This uses scipy.interpolate.make_interp_spline and masked array to deal with np.nan.

Progress of the PR

• Replace scipy.interpolate.interp1d with scipy.interpolate.make_interp_spline
• [n/a] update docstring (if appropriate),
• [n/a] update user guide (if appropriate),
• add an changelog entry in the upcoming_changes folder (see upcoming_changes/README.rst),
• Check formatting changelog entry in the readthedocs doc build of this PR (link in github checks)
• add tests,
• ready for review.

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (b1d4de9) 81.38% compared to head (d08b12f) 81.30%.

Additional details and impacted files

@@                  Coverage Diff                   @@
##           RELEASE_next_major    #3233      +/-   ##
======================================================
- Coverage               81.38%   81.30%   -0.09%     
======================================================
  Files                     173      173              
  Lines                   24352    24348       -4     
  Branches                 5677     5676       -1     
======================================================
- Hits                    19818    19795      -23     
- Misses                   3222     3245      +23     
+ Partials                 1312     1308       -4     

Files	Coverage Δ
hyperspy/_components/scalable_fixed_pattern.py	100.00% <100.00%> (ø)
hyperspy/_signals/signal1d.py	79.84% <100.00%> (+0.12%)	⬆️
hyperspy/misc/eels/base_gos.py	90.58% <100.00%> (ø)
hyperspy/misc/eels/hydrogenic_gos.py	92.70% <100.00%> (ø)
hyperspy/signal.py	77.73% <ø> (ø)
hyperspy/signal_tools.py	74.27% <85.71%> (+0.08%)	⬆️

... and 3 files with indirect coverage changes

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[ericpre]

@CSSFrancis, can you review this PR please? :)

[CSSFrancis]

This looks good to merge. This should require changes to the hyperpsy_gui packages as well correct?

[ericpre]

This looks good to merge. This should require changes to the hyperpsy_gui packages as well correct?

Yes, that's right.