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

[github-actions]

This pull request changes the compat entry for the DomainSets package from 0.6, 0.7 to 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 0.00%. Comparing base (32b251d) to head (bce9f86).

❗ There is a different number of reports uploaded between BASE (32b251d) and HEAD (bce9f86). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (32b251d)	HEAD (bce9f86)
	6	5

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #270       +/-   ##
==========================================
- Coverage   91.62%   0.00%   -91.63%     
==========================================
  Files          19      19               
  Lines        1804    1763       -41     
==========================================
- Hits         1653       0     -1653     
- Misses        151    1763     +1612     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.