CompatHelper: bump compat for OhMyThreads to 0.8, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the OhMyThreads package from 0.5, 0.6, 0.7 to 0.5, 0.6, 0.7, 0.8.
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 40.17%. Comparing base (46c6f3c) to head (31d8801).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #102   +/-   ##
=======================================
  Coverage   40.17%   40.17%           
=======================================
  Files          27       27           
  Lines        2071     2071           
=======================================
  Hits          832      832           
  Misses       1239     1239           

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