Bump compat for CategoricalArrays to 1.0

[ablaom]

Replaces #310

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.67%. Comparing base (02428f0) to head (108508e).
⚠️ Report is 20 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #311      +/-   ##
==========================================
- Coverage   94.85%   92.67%   -2.18%     
==========================================
  Files          15       14       -1     
  Lines         525      519       -6     
==========================================
- Hits          498      481      -17     
- Misses         27       38      +11     

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[ablaom]

Docs failing because of dependency MLJ, which has not yet bumped it's compat for CategoricalArrays.

[ablaom]

The codecov fail is a red herring. This PR doesn't add any code of substance or rm tests.