Bump compat CategoricalArrays="1"

[ablaom]

This PR needs:

• Bump [compat] entry: CategoricalArrays="1.0" MLJTransforms.jl#61
• Bump CategoricalArrays compat to 1.0 MLJDecisionTreeInterface.jl#60
• Bump compats for StatsBase and CategoricalDistributions MLJMultivariateStatsInterface.jl#63
• new MLJBase with CategoricalArrays="1.0"

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.27%. Comparing base (910c741) to head (83966c7).
⚠️ Report is 8 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #597      +/-   ##
==========================================
- Coverage   76.69%   76.27%   -0.43%     
==========================================
  Files           8        8              
  Lines         472      472              
==========================================
- Hits          362      360       -2     
- Misses        110      112       +2     

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