Fix API changes in scipy and scikit-image

[ericpre]

xref hyperspy/hyperspy-extensions-list#49

Progress of the PR

• Fix API changes for scipy, has changed since a long time: https://docs.scipy.org/doc/scipy-1.5.0/reference/generated/scipy.signal.windows.tukey.html?highlight=tukey#scipy.signal.windows.tukey
• Fix API changes for scikit-image, deprecated since 0.21: https://scikit-image.org/docs/0.21.x/api/skimage.restoration.html#skimage.restoration.unwrap_phase,
• [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)
• [n/a] add tests,
• ready for review.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (04623bd) 80.23% compared to head (72eef0b) 80.24%.

Additional details and impacted files

@@                 Coverage Diff                 @@
##           RELEASE_next_patch    #3306   +/-   ##
===================================================
  Coverage               80.23%   80.24%           
===================================================
  Files                     147      147           
  Lines                   21848    21854    +6     
  Branches                 5141     5142    +1     
===================================================
+ Hits                    17530    17536    +6     
  Misses                   3112     3112           
  Partials                 1206     1206           

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