Add scikit-image dependency

[pjonsson]

Reason for this pull request

This is imported in transformations.py,
so add it as a dependency.

Proposed changes

• Closes #xxxx

• Tests added / passed

• Pull Request Title will make sense in ODC Release Notes

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📚 Documentation preview 📚: https://opendatacube--2307.org.readthedocs.build/en/2307/

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.14%. Comparing base (ae2eacf) to head (5fe9dab).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #2307   +/-   ##
========================================
  Coverage    86.14%   86.14%           
========================================
  Files          155      155           
  Lines        16959    16959           
========================================
  Hits         14609    14609           
  Misses        2350     2350           

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