CompatHelper: bump compat for MeasureTheory to 0.18, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the MeasureTheory package from 0.17.2 to 0.17.2, 0.18.
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 40.97%. Comparing base (1b8aecf) to head (4f35497).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #40      +/-   ##
==========================================
- Coverage   42.36%   40.97%   -1.40%     
==========================================
  Files          45       45              
  Lines        1435     1391      -44     
==========================================
- Hits          608      570      -38     
+ Misses        827      821       -6     

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