CompatHelper: bump compat for EvoTrees to 0.15 for package docs, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the EvoTrees package from 0.14.7 to 0.14.7, 0.15 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.

[github-actions]

Pull Request Test Coverage Report for Build 5384304606

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 96.647%

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Totals
Change from base Build 5137982003:	0.0%
Covered Lines:	836
Relevant Lines:	865

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💛 - Coveralls

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (304dbc4) 96.64% compared to head (edeadf7) 96.64%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #89   +/-   ##
=======================================
  Coverage   96.64%   96.64%           
=======================================
  Files          11       11           
  Lines         865      865           
=======================================
  Hits          836      836           
  Misses         29       29           

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