Replaced np.object with object in plot_permutation_importance.

[RobertSamoilescu]

np.object is deprecated in latest release of numpy (1.24).

[mauicv]

Note that I think the latest version the ci is run on is numpy==1.23.5. I think other libraries must be constraining the NumPy version.

[codecov]

Codecov Report

Merging #872 (fecfd06) into master (28b1597) will not change coverage.
The diff coverage is 100.00%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #872   +/-   ##
=======================================
  Coverage   85.28%   85.28%           
=======================================
  Files          74       74           
  Lines        8759     8759           
=======================================
  Hits         7470     7470           
  Misses       1289     1289           

Flag	Coverage Δ
macos-latest-3.10	?
ubuntu-latest-3.10	85.23% <100.00%> (ø)
ubuntu-latest-3.7	85.14% <100.00%> (ø)
ubuntu-latest-3.8	85.07% <100.00%> (-0.10%)	⬇️
ubuntu-latest-3.9	85.17% <100.00%> (ø)
windows-latest-3.9	82.91% <100.00%> (ø)

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Impacted Files	Coverage Δ
alibi/explainers/permutation_importance.py	97.09% <100.00%> (ø)

[jklaise]

Can we check if this is backwards compatible with older versions of numpy?

[jklaise]

Seems like should be fine from at least 1.20: https://numpy.org/devdocs/release/1.20.0-notes.html#deprecations