CompatHelper: bump compat for ChunkSplitters to 3, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the ChunkSplitters package from 2 to 3.

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

All modified and coverable lines are covered by tests ✅

Project coverage is 83.72%. Comparing base (57431f6) to head (de8baab).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #189   +/-   ##
=======================================
  Coverage   83.72%   83.72%           
=======================================
  Files          11       11           
  Lines         688      688           
=======================================
  Hits          576      576           
  Misses        112      112           

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