CompatHelper: bump compat for LearnBase to 0.6, (keep existing compat)

[github-actions[bot]]

This pull request changes the compat entry for the LearnBase package from 0.4 to 0.4, 0.6. 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[bot]]

Codecov Report

Merging #102 (f011bcc) into master (f416a6b) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #102   +/-   ##
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  Coverage   89.81%   89.81%           
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  Files          37       37           
  Lines        1473     1473           
=======================================
  Hits         1323     1323           
  Misses        150      150           

Flag	Coverage Δ
unittests	89.81% <ø> (ø)

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[simonmandlik]

Don't merge until there is a compatible version of MLLabelUtils as well.

[racinmat]

MLLabelUtils has compatible version, but the MLDataPattern does not, we need to wait till they release new version. the needed version is in this diff https://github.com/JuliaML/MLDataPattern.jl/compare/v0.5.5...master

[simonmandlik]

Closing because we got rid of all these packages in favor of https://github.com/JuliaML/MLUtils.jl