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 0.26, 0.27, 0.28, 0.29, 0.30, 0.31, 0.32, 0.33 to 0.26, 0.27, 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

Merging #199 (1ad81f9) into master (b817712) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #199   +/-   ##
=======================================
  Coverage   86.65%   86.66%           
=======================================
  Files          30       30           
  Lines       12648    12648           
=======================================
+ Hits        10960    10961    +1     
+ Misses       1688     1687    -1     

see 1 file with indirect coverage changes

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