CompatHelper: bump compat for MLJDecisionTreeInterface to 0.3 for package docs, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the MLJDecisionTreeInterface package from 0.1.3, 0.2 to 0.1.3, 0.2, 0.3 for package docs.
This keeps the compat entries for earlier versions.

Note: I have not tested your package with this new compat entry.
It is your responsibility to make sure that your package tests pass before you merge this pull request.

[codecov]

Codecov Report

Base: 83.67% // Head: 83.67% // No change to project coverage 👍

Coverage data is based on head (3375169) compared to base (b941956).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #388   +/-   ##
=======================================
  Coverage   83.67%   83.67%           
=======================================
  Files          19       19           
  Lines        1035     1035           
=======================================
  Hits          866      866           
  Misses        169      169           

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