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

[github-actions[bot]]

This pull request changes the compat entry for the StatsBase package from 0.31, 0.32, 0.33 to 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[bot]]

Codecov Report

Patch and project coverage have no change.

Comparison is base (1bfad8a) 95.90% compared to head (2bc51b8) 95.90%.

:exclamation: Current head 2bc51b8 differs from pull request most recent head f350a97. Consider uploading reports for the commit f350a97 to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #687 +/- ## ======================================= Coverage 95.90% 95.90% ======================================= Files 29 29 Lines 2732 2732 ======================================= Hits 2620 2620 Misses 112 112 ```

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