CompatHelper: add new compat entry for StatsBase at version 0.34, (keep existing compat)

[github-actions]

This pull request sets the compat entry for the StatsBase package to 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.
Note: Consider registering a new release of your package immediately after merging this PR, as downstream packages may depend on this for tests to pass.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 2.94%. Comparing base (a999ff7) to head (a3e0580).
Report is 2 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff          @@
##            main      #3   +/-   ##
=====================================
  Coverage   2.94%   2.94%           
=====================================
  Files          2       2           
  Lines         34      34           
=====================================
  Hits           1       1           
  Misses        33      33           

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