Add workaround for autodocs failing to handle DataArray

[djhoese]

Sphinx-autodoc-typehints has trouble when parsing the DataArray import. It issues a warning about the optional xarray dependency "iris" not being available. I could have installed iris, but Claude identified this simpler workaround.

Upstream issue: tox-dev/sphinx-autodoc-typehints#768

• Closes #xxxx
• Tests added
• Tests passed
• Fully documented

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.68%. Comparing base (8aca19c) to head (61f3bae).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #748   +/-   ##
=======================================
  Coverage   93.68%   93.68%           
=======================================
  Files          89       89           
  Lines       13721    13721           
=======================================
  Hits        12854    12854           
  Misses        867      867           

Flag	Coverage Δ
unittests	93.68% <ø> (ø)

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[djhoese]

Ugh WTF I merged this because I didn't see any red in CI but it looks like readthedocs didn't run here and is now failing on main.