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

[github-actions[bot]]

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

Pull Request Test Coverage Report for Build 5748515171

• 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 5389540790:	0.0%
Covered Lines:	836
Relevant Lines:	865

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💛 - Coveralls

[codecov[bot]]

Codecov Report

Patch and project coverage have no change.

Comparison is base (3689384) 96.64% compared to head (e04642c) 96.64%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #91 +/- ## ======================================= Coverage 96.64% 96.64% ======================================= Files 11 11 Lines 865 865 ======================================= Hits 836 836 Misses 29 29 ```

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