CompatHelper: bump compat for DataStructures to 0.19, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the DataStructures package from 0.18 to 0.18, 0.19.
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

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 68.05%. Comparing base (4b16a13) to head (2f96320).
⚠️ Report is 54 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #209   +/-   ##
=======================================
  Coverage   68.05%   68.05%           
=======================================
  Files          38       38           
  Lines        5681     5681           
=======================================
  Hits         3866     3866           
  Misses       1815     1815           

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