CompatHelper: bump compat for "StatsBase" to "0.33"

[github-actions]

This pull request changes the compat entry for the StatsBase package from 0.32 to 0.32, 0.33.

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

Merging #18 into master will not change coverage by %.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #18   +/-   ##
=======================================
  Coverage   92.29%   92.29%           
=======================================
  Files           8        8           
  Lines         558      558           
=======================================
  Hits          515      515           
  Misses         43       43           

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