CompatHelper: bump compat for StatsBase to 0.34, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the StatsBase package from 0.28,0.29,0.30,0.31,0.32,0.33 to 0.28,0.29,0.30,0.31,0.32,0.33, 0.34.
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

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (2fe6d95) to head (00817b4).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main        #8   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files            3         3           
  Lines          114       114           
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  Hits           114       114           

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