CompatHelper: bump compat for MLJFlux to 0.4, (keep existing compat)

[github-actions[bot]]

This pull request changes the compat entry for the MLJFlux package from 0.2.10, 0.3 to 0.2.10, 0.3, 0.4. 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-commenter]

Codecov Report

Merging #95 (502e8d6) into main (b20ead0) will decrease coverage by 0.27%. The diff coverage is n/a.

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@@            Coverage Diff             @@
##             main      #95      +/-   ##
==========================================
- Coverage   71.71%   71.44%   -0.27%     
==========================================
  Files          20       20              
  Lines         760      760              
==========================================
- Hits          545      543       -2     
- Misses        215      217       +2     

see 1 file with indirect coverage changes

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