CompatHelper: bump compat for Compat to 4, (keep existing compat)

[github-actions[bot]]

This pull request changes the compat entry for the Compat package from 3 to 3, 4. 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

Merging #52 (0ef4973) into master (dd13a55) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #52   +/-   ##
=======================================
  Coverage   97.29%   97.29%           
=======================================
  Files           8        8           
  Lines         222      222           
=======================================
  Hits          216      216           
  Misses          6        6           

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[simsurace]

Could someone re-run the CI and possibly merge this (I saw no failures locally)? This is holding back having the most recent version of DataFrames installed in the same environment.

[willtebbutt]

Thanks for commenting on this @simsurace -- should be available on the general registry shortly!