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 0.33 to 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-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (aa09606) 31.78% compared to head (f5c4c8d) 31.78%.

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #100   +/-   ##
=======================================
  Coverage   31.78%   31.78%           
=======================================
  Files          32       32           
  Lines        1337     1337           
=======================================
  Hits          425      425           
  Misses        912      912           

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