CompatHelper: bump compat for Aqua in [extras] to 0.8

[github-actions]

This pull request changes the compat entry for the Aqua package from 0.6 to 0.6, 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 100.00%. Comparing base (e4b90d1) to head (0ed9e59).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #84   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            5         5           
  Lines          118       118           
=========================================
  Hits           118       118           

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